1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
6 Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
31 #include "breakpoint.h"
35 #include "cli/cli-script.h"
37 #include "gdbthread.h"
47 #include "gdb_assert.h"
49 /* Prototypes for local functions */
51 static void signals_info (char *, int);
53 static void handle_command (char *, int);
55 static void sig_print_info (enum target_signal);
57 static void sig_print_header (void);
59 static void resume_cleanups (void *);
61 static int hook_stop_stub (void *);
63 static int restore_selected_frame (void *);
65 static void build_infrun (void);
67 static int follow_fork (void);
69 static void set_schedlock_func (char *args, int from_tty,
70 struct cmd_list_element *c);
72 struct execution_control_state;
74 static int currently_stepping (struct execution_control_state *ecs);
76 static void xdb_handle_command (char *args, int from_tty);
78 static int prepare_to_proceed (void);
80 void _initialize_infrun (void);
82 int inferior_ignoring_startup_exec_events = 0;
83 int inferior_ignoring_leading_exec_events = 0;
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug = 0;
90 /* In asynchronous mode, but simulating synchronous execution. */
92 int sync_execution = 0;
94 /* wait_for_inferior and normal_stop use this to notify the user
95 when the inferior stopped in a different thread than it had been
98 static ptid_t previous_inferior_ptid;
100 /* This is true for configurations that may follow through execl() and
101 similar functions. At present this is only true for HP-UX native. */
103 #ifndef MAY_FOLLOW_EXEC
104 #define MAY_FOLLOW_EXEC (0)
107 static int may_follow_exec = MAY_FOLLOW_EXEC;
109 /* If the program uses ELF-style shared libraries, then calls to
110 functions in shared libraries go through stubs, which live in a
111 table called the PLT (Procedure Linkage Table). The first time the
112 function is called, the stub sends control to the dynamic linker,
113 which looks up the function's real address, patches the stub so
114 that future calls will go directly to the function, and then passes
115 control to the function.
117 If we are stepping at the source level, we don't want to see any of
118 this --- we just want to skip over the stub and the dynamic linker.
119 The simple approach is to single-step until control leaves the
122 However, on some systems (e.g., Red Hat's 5.2 distribution) the
123 dynamic linker calls functions in the shared C library, so you
124 can't tell from the PC alone whether the dynamic linker is still
125 running. In this case, we use a step-resume breakpoint to get us
126 past the dynamic linker, as if we were using "next" to step over a
129 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
130 linker code or not. Normally, this means we single-step. However,
131 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
132 address where we can place a step-resume breakpoint to get past the
133 linker's symbol resolution function.
135 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
136 pretty portable way, by comparing the PC against the address ranges
137 of the dynamic linker's sections.
139 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
140 it depends on internal details of the dynamic linker. It's usually
141 not too hard to figure out where to put a breakpoint, but it
142 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
143 sanity checking. If it can't figure things out, returning zero and
144 getting the (possibly confusing) stepping behavior is better than
145 signalling an error, which will obscure the change in the
148 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
149 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
152 /* This function returns TRUE if pc is the address of an instruction
153 that lies within the dynamic linker (such as the event hook, or the
156 This function must be used only when a dynamic linker event has
157 been caught, and the inferior is being stepped out of the hook, or
158 undefined results are guaranteed. */
160 #ifndef SOLIB_IN_DYNAMIC_LINKER
161 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
164 /* On MIPS16, a function that returns a floating point value may call
165 a library helper function to copy the return value to a floating point
166 register. The IGNORE_HELPER_CALL macro returns non-zero if we
167 should ignore (i.e. step over) this function call. */
168 #ifndef IGNORE_HELPER_CALL
169 #define IGNORE_HELPER_CALL(pc) 0
172 /* On some systems, the PC may be left pointing at an instruction that won't
173 actually be executed. This is usually indicated by a bit in the PSW. If
174 we find ourselves in such a state, then we step the target beyond the
175 nullified instruction before returning control to the user so as to avoid
178 #ifndef INSTRUCTION_NULLIFIED
179 #define INSTRUCTION_NULLIFIED 0
182 /* We can't step off a permanent breakpoint in the ordinary way, because we
183 can't remove it. Instead, we have to advance the PC to the next
184 instruction. This macro should expand to a pointer to a function that
185 does that, or zero if we have no such function. If we don't have a
186 definition for it, we have to report an error. */
187 #ifndef SKIP_PERMANENT_BREAKPOINT
188 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
190 default_skip_permanent_breakpoint (void)
193 The program is stopped at a permanent breakpoint, but GDB does not know\n\
194 how to step past a permanent breakpoint on this architecture. Try using\n\
195 a command like `return' or `jump' to continue execution.");
200 /* Convert the #defines into values. This is temporary until wfi control
201 flow is completely sorted out. */
203 #ifndef HAVE_STEPPABLE_WATCHPOINT
204 #define HAVE_STEPPABLE_WATCHPOINT 0
206 #undef HAVE_STEPPABLE_WATCHPOINT
207 #define HAVE_STEPPABLE_WATCHPOINT 1
210 #ifndef CANNOT_STEP_HW_WATCHPOINTS
211 #define CANNOT_STEP_HW_WATCHPOINTS 0
213 #undef CANNOT_STEP_HW_WATCHPOINTS
214 #define CANNOT_STEP_HW_WATCHPOINTS 1
217 /* Tables of how to react to signals; the user sets them. */
219 static unsigned char *signal_stop;
220 static unsigned char *signal_print;
221 static unsigned char *signal_program;
223 #define SET_SIGS(nsigs,sigs,flags) \
225 int signum = (nsigs); \
226 while (signum-- > 0) \
227 if ((sigs)[signum]) \
228 (flags)[signum] = 1; \
231 #define UNSET_SIGS(nsigs,sigs,flags) \
233 int signum = (nsigs); \
234 while (signum-- > 0) \
235 if ((sigs)[signum]) \
236 (flags)[signum] = 0; \
239 /* Value to pass to target_resume() to cause all threads to resume */
241 #define RESUME_ALL (pid_to_ptid (-1))
243 /* Command list pointer for the "stop" placeholder. */
245 static struct cmd_list_element *stop_command;
247 /* Nonzero if breakpoints are now inserted in the inferior. */
249 static int breakpoints_inserted;
251 /* Function inferior was in as of last step command. */
253 static struct symbol *step_start_function;
255 /* Nonzero if we are expecting a trace trap and should proceed from it. */
257 static int trap_expected;
260 /* Nonzero if we want to give control to the user when we're notified
261 of shared library events by the dynamic linker. */
262 static int stop_on_solib_events;
265 /* Nonzero means expecting a trace trap
266 and should stop the inferior and return silently when it happens. */
270 /* Nonzero means expecting a trap and caller will handle it themselves.
271 It is used after attach, due to attaching to a process;
272 when running in the shell before the child program has been exec'd;
273 and when running some kinds of remote stuff (FIXME?). */
275 enum stop_kind stop_soon;
277 /* Nonzero if proceed is being used for a "finish" command or a similar
278 situation when stop_registers should be saved. */
280 int proceed_to_finish;
282 /* Save register contents here when about to pop a stack dummy frame,
283 if-and-only-if proceed_to_finish is set.
284 Thus this contains the return value from the called function (assuming
285 values are returned in a register). */
287 struct regcache *stop_registers;
289 /* Nonzero if program stopped due to error trying to insert breakpoints. */
291 static int breakpoints_failed;
293 /* Nonzero after stop if current stack frame should be printed. */
295 static int stop_print_frame;
297 static struct breakpoint *step_resume_breakpoint = NULL;
299 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
300 interactions with an inferior that is running a kernel function
301 (aka, a system call or "syscall"). wait_for_inferior therefore
302 may have a need to know when the inferior is in a syscall. This
303 is a count of the number of inferior threads which are known to
304 currently be running in a syscall. */
305 static int number_of_threads_in_syscalls;
307 /* This is a cached copy of the pid/waitstatus of the last event
308 returned by target_wait()/deprecated_target_wait_hook(). This
309 information is returned by get_last_target_status(). */
310 static ptid_t target_last_wait_ptid;
311 static struct target_waitstatus target_last_waitstatus;
313 /* This is used to remember when a fork, vfork or exec event
314 was caught by a catchpoint, and thus the event is to be
315 followed at the next resume of the inferior, and not
319 enum target_waitkind kind;
326 char *execd_pathname;
330 static const char follow_fork_mode_child[] = "child";
331 static const char follow_fork_mode_parent[] = "parent";
333 static const char *follow_fork_mode_kind_names[] = {
334 follow_fork_mode_child,
335 follow_fork_mode_parent,
339 static const char *follow_fork_mode_string = follow_fork_mode_parent;
345 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
347 return target_follow_fork (follow_child);
351 follow_inferior_reset_breakpoints (void)
353 /* Was there a step_resume breakpoint? (There was if the user
354 did a "next" at the fork() call.) If so, explicitly reset its
357 step_resumes are a form of bp that are made to be per-thread.
358 Since we created the step_resume bp when the parent process
359 was being debugged, and now are switching to the child process,
360 from the breakpoint package's viewpoint, that's a switch of
361 "threads". We must update the bp's notion of which thread
362 it is for, or it'll be ignored when it triggers. */
364 if (step_resume_breakpoint)
365 breakpoint_re_set_thread (step_resume_breakpoint);
367 /* Reinsert all breakpoints in the child. The user may have set
368 breakpoints after catching the fork, in which case those
369 were never set in the child, but only in the parent. This makes
370 sure the inserted breakpoints match the breakpoint list. */
372 breakpoint_re_set ();
373 insert_breakpoints ();
376 /* EXECD_PATHNAME is assumed to be non-NULL. */
379 follow_exec (int pid, char *execd_pathname)
382 struct target_ops *tgt;
384 if (!may_follow_exec)
387 /* This is an exec event that we actually wish to pay attention to.
388 Refresh our symbol table to the newly exec'd program, remove any
391 If there are breakpoints, they aren't really inserted now,
392 since the exec() transformed our inferior into a fresh set
395 We want to preserve symbolic breakpoints on the list, since
396 we have hopes that they can be reset after the new a.out's
397 symbol table is read.
399 However, any "raw" breakpoints must be removed from the list
400 (e.g., the solib bp's), since their address is probably invalid
403 And, we DON'T want to call delete_breakpoints() here, since
404 that may write the bp's "shadow contents" (the instruction
405 value that was overwritten witha TRAP instruction). Since
406 we now have a new a.out, those shadow contents aren't valid. */
407 update_breakpoints_after_exec ();
409 /* If there was one, it's gone now. We cannot truly step-to-next
410 statement through an exec(). */
411 step_resume_breakpoint = NULL;
412 step_range_start = 0;
415 /* What is this a.out's name? */
416 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
418 /* We've followed the inferior through an exec. Therefore, the
419 inferior has essentially been killed & reborn. */
421 /* First collect the run target in effect. */
422 tgt = find_run_target ();
423 /* If we can't find one, things are in a very strange state... */
425 error ("Could find run target to save before following exec");
427 gdb_flush (gdb_stdout);
428 target_mourn_inferior ();
429 inferior_ptid = pid_to_ptid (saved_pid);
430 /* Because mourn_inferior resets inferior_ptid. */
433 /* That a.out is now the one to use. */
434 exec_file_attach (execd_pathname, 0);
436 /* And also is where symbols can be found. */
437 symbol_file_add_main (execd_pathname, 0);
439 /* Reset the shared library package. This ensures that we get
440 a shlib event when the child reaches "_start", at which point
441 the dld will have had a chance to initialize the child. */
442 #if defined(SOLIB_RESTART)
445 #ifdef SOLIB_CREATE_INFERIOR_HOOK
446 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
449 /* Reinsert all breakpoints. (Those which were symbolic have
450 been reset to the proper address in the new a.out, thanks
451 to symbol_file_command...) */
452 insert_breakpoints ();
454 /* The next resume of this inferior should bring it to the shlib
455 startup breakpoints. (If the user had also set bp's on
456 "main" from the old (parent) process, then they'll auto-
457 matically get reset there in the new process.) */
460 /* Non-zero if we just simulating a single-step. This is needed
461 because we cannot remove the breakpoints in the inferior process
462 until after the `wait' in `wait_for_inferior'. */
463 static int singlestep_breakpoints_inserted_p = 0;
465 /* The thread we inserted single-step breakpoints for. */
466 static ptid_t singlestep_ptid;
468 /* If another thread hit the singlestep breakpoint, we save the original
469 thread here so that we can resume single-stepping it later. */
470 static ptid_t saved_singlestep_ptid;
471 static int stepping_past_singlestep_breakpoint;
474 /* Things to clean up if we QUIT out of resume (). */
476 resume_cleanups (void *ignore)
481 static const char schedlock_off[] = "off";
482 static const char schedlock_on[] = "on";
483 static const char schedlock_step[] = "step";
484 static const char *scheduler_mode = schedlock_off;
485 static const char *scheduler_enums[] = {
493 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
495 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
496 the set command passed as a parameter. The clone operation will
497 include (BUG?) any ``set'' command callback, if present.
498 Commands like ``info set'' call all the ``show'' command
499 callbacks. Unfortunately, for ``show'' commands cloned from
500 ``set'', this includes callbacks belonging to ``set'' commands.
501 Making this worse, this only occures if add_show_from_set() is
502 called after add_cmd_sfunc() (BUG?). */
503 if (cmd_type (c) == set_cmd)
504 if (!target_can_lock_scheduler)
506 scheduler_mode = schedlock_off;
507 error ("Target '%s' cannot support this command.", target_shortname);
512 /* Resume the inferior, but allow a QUIT. This is useful if the user
513 wants to interrupt some lengthy single-stepping operation
514 (for child processes, the SIGINT goes to the inferior, and so
515 we get a SIGINT random_signal, but for remote debugging and perhaps
516 other targets, that's not true).
518 STEP nonzero if we should step (zero to continue instead).
519 SIG is the signal to give the inferior (zero for none). */
521 resume (int step, enum target_signal sig)
523 int should_resume = 1;
524 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
527 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
530 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
531 over an instruction that causes a page fault without triggering
532 a hardware watchpoint. The kernel properly notices that it shouldn't
533 stop, because the hardware watchpoint is not triggered, but it forgets
534 the step request and continues the program normally.
535 Work around the problem by removing hardware watchpoints if a step is
536 requested, GDB will check for a hardware watchpoint trigger after the
538 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
539 remove_hw_watchpoints ();
542 /* Normally, by the time we reach `resume', the breakpoints are either
543 removed or inserted, as appropriate. The exception is if we're sitting
544 at a permanent breakpoint; we need to step over it, but permanent
545 breakpoints can't be removed. So we have to test for it here. */
546 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
547 SKIP_PERMANENT_BREAKPOINT ();
549 if (SOFTWARE_SINGLE_STEP_P () && step)
551 /* Do it the hard way, w/temp breakpoints */
552 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
553 /* ...and don't ask hardware to do it. */
555 /* and do not pull these breakpoints until after a `wait' in
556 `wait_for_inferior' */
557 singlestep_breakpoints_inserted_p = 1;
558 singlestep_ptid = inferior_ptid;
561 /* If there were any forks/vforks/execs that were caught and are
562 now to be followed, then do so. */
563 switch (pending_follow.kind)
565 case TARGET_WAITKIND_FORKED:
566 case TARGET_WAITKIND_VFORKED:
567 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
572 case TARGET_WAITKIND_EXECD:
573 /* follow_exec is called as soon as the exec event is seen. */
574 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
581 /* Install inferior's terminal modes. */
582 target_terminal_inferior ();
588 resume_ptid = RESUME_ALL; /* Default */
590 if ((step || singlestep_breakpoints_inserted_p) &&
591 (stepping_past_singlestep_breakpoint
592 || (!breakpoints_inserted && breakpoint_here_p (read_pc ()))))
594 /* Stepping past a breakpoint without inserting breakpoints.
595 Make sure only the current thread gets to step, so that
596 other threads don't sneak past breakpoints while they are
599 resume_ptid = inferior_ptid;
602 if ((scheduler_mode == schedlock_on) ||
603 (scheduler_mode == schedlock_step &&
604 (step || singlestep_breakpoints_inserted_p)))
606 /* User-settable 'scheduler' mode requires solo thread resume. */
607 resume_ptid = inferior_ptid;
610 if (CANNOT_STEP_BREAKPOINT)
612 /* Most targets can step a breakpoint instruction, thus
613 executing it normally. But if this one cannot, just
614 continue and we will hit it anyway. */
615 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
618 target_resume (resume_ptid, step, sig);
621 discard_cleanups (old_cleanups);
625 /* Clear out all variables saying what to do when inferior is continued.
626 First do this, then set the ones you want, then call `proceed'. */
629 clear_proceed_status (void)
632 step_range_start = 0;
634 step_frame_id = null_frame_id;
635 step_over_calls = STEP_OVER_UNDEBUGGABLE;
637 stop_soon = NO_STOP_QUIETLY;
638 proceed_to_finish = 0;
639 breakpoint_proceeded = 1; /* We're about to proceed... */
641 /* Discard any remaining commands or status from previous stop. */
642 bpstat_clear (&stop_bpstat);
645 /* This should be suitable for any targets that support threads. */
648 prepare_to_proceed (void)
651 struct target_waitstatus wait_status;
653 /* Get the last target status returned by target_wait(). */
654 get_last_target_status (&wait_ptid, &wait_status);
656 /* Make sure we were stopped either at a breakpoint, or because
658 if (wait_status.kind != TARGET_WAITKIND_STOPPED
659 || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
660 wait_status.value.sig != TARGET_SIGNAL_INT))
665 if (!ptid_equal (wait_ptid, minus_one_ptid)
666 && !ptid_equal (inferior_ptid, wait_ptid))
668 /* Switched over from WAIT_PID. */
669 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
671 if (wait_pc != read_pc ())
673 /* Switch back to WAIT_PID thread. */
674 inferior_ptid = wait_ptid;
676 /* FIXME: This stuff came from switch_to_thread() in
677 thread.c (which should probably be a public function). */
678 flush_cached_frames ();
679 registers_changed ();
681 select_frame (get_current_frame ());
684 /* We return 1 to indicate that there is a breakpoint here,
685 so we need to step over it before continuing to avoid
686 hitting it straight away. */
687 if (breakpoint_here_p (wait_pc))
695 /* Record the pc of the program the last time it stopped. This is
696 just used internally by wait_for_inferior, but need to be preserved
697 over calls to it and cleared when the inferior is started. */
698 static CORE_ADDR prev_pc;
700 /* Basic routine for continuing the program in various fashions.
702 ADDR is the address to resume at, or -1 for resume where stopped.
703 SIGGNAL is the signal to give it, or 0 for none,
704 or -1 for act according to how it stopped.
705 STEP is nonzero if should trap after one instruction.
706 -1 means return after that and print nothing.
707 You should probably set various step_... variables
708 before calling here, if you are stepping.
710 You should call clear_proceed_status before calling proceed. */
713 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
718 step_start_function = find_pc_function (read_pc ());
722 if (addr == (CORE_ADDR) -1)
724 /* If there is a breakpoint at the address we will resume at,
725 step one instruction before inserting breakpoints
726 so that we do not stop right away (and report a second
727 hit at this breakpoint). */
729 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
732 #ifndef STEP_SKIPS_DELAY
733 #define STEP_SKIPS_DELAY(pc) (0)
734 #define STEP_SKIPS_DELAY_P (0)
736 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
737 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
738 is slow (it needs to read memory from the target). */
739 if (STEP_SKIPS_DELAY_P
740 && breakpoint_here_p (read_pc () + 4)
741 && STEP_SKIPS_DELAY (read_pc ()))
749 /* In a multi-threaded task we may select another thread
750 and then continue or step.
752 But if the old thread was stopped at a breakpoint, it
753 will immediately cause another breakpoint stop without
754 any execution (i.e. it will report a breakpoint hit
755 incorrectly). So we must step over it first.
757 prepare_to_proceed checks the current thread against the thread
758 that reported the most recent event. If a step-over is required
759 it returns TRUE and sets the current thread to the old thread. */
760 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
764 /* We will get a trace trap after one instruction.
765 Continue it automatically and insert breakpoints then. */
769 insert_breakpoints ();
770 /* If we get here there was no call to error() in
771 insert breakpoints -- so they were inserted. */
772 breakpoints_inserted = 1;
775 if (siggnal != TARGET_SIGNAL_DEFAULT)
776 stop_signal = siggnal;
777 /* If this signal should not be seen by program,
778 give it zero. Used for debugging signals. */
779 else if (!signal_program[stop_signal])
780 stop_signal = TARGET_SIGNAL_0;
782 annotate_starting ();
784 /* Make sure that output from GDB appears before output from the
786 gdb_flush (gdb_stdout);
788 /* Refresh prev_pc value just prior to resuming. This used to be
789 done in stop_stepping, however, setting prev_pc there did not handle
790 scenarios such as inferior function calls or returning from
791 a function via the return command. In those cases, the prev_pc
792 value was not set properly for subsequent commands. The prev_pc value
793 is used to initialize the starting line number in the ecs. With an
794 invalid value, the gdb next command ends up stopping at the position
795 represented by the next line table entry past our start position.
796 On platforms that generate one line table entry per line, this
797 is not a problem. However, on the ia64, the compiler generates
798 extraneous line table entries that do not increase the line number.
799 When we issue the gdb next command on the ia64 after an inferior call
800 or a return command, we often end up a few instructions forward, still
801 within the original line we started.
803 An attempt was made to have init_execution_control_state () refresh
804 the prev_pc value before calculating the line number. This approach
805 did not work because on platforms that use ptrace, the pc register
806 cannot be read unless the inferior is stopped. At that point, we
807 are not guaranteed the inferior is stopped and so the read_pc ()
808 call can fail. Setting the prev_pc value here ensures the value is
809 updated correctly when the inferior is stopped. */
810 prev_pc = read_pc ();
812 /* Resume inferior. */
813 resume (oneproc || step || bpstat_should_step (), stop_signal);
815 /* Wait for it to stop (if not standalone)
816 and in any case decode why it stopped, and act accordingly. */
817 /* Do this only if we are not using the event loop, or if the target
818 does not support asynchronous execution. */
819 if (!event_loop_p || !target_can_async_p ())
821 wait_for_inferior ();
827 /* Start remote-debugging of a machine over a serial link. */
833 init_wait_for_inferior ();
834 stop_soon = STOP_QUIETLY;
837 /* Always go on waiting for the target, regardless of the mode. */
838 /* FIXME: cagney/1999-09-23: At present it isn't possible to
839 indicate to wait_for_inferior that a target should timeout if
840 nothing is returned (instead of just blocking). Because of this,
841 targets expecting an immediate response need to, internally, set
842 things up so that the target_wait() is forced to eventually
844 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
845 differentiate to its caller what the state of the target is after
846 the initial open has been performed. Here we're assuming that
847 the target has stopped. It should be possible to eventually have
848 target_open() return to the caller an indication that the target
849 is currently running and GDB state should be set to the same as
851 wait_for_inferior ();
855 /* Initialize static vars when a new inferior begins. */
858 init_wait_for_inferior (void)
860 /* These are meaningless until the first time through wait_for_inferior. */
863 breakpoints_inserted = 0;
864 breakpoint_init_inferior (inf_starting);
866 /* Don't confuse first call to proceed(). */
867 stop_signal = TARGET_SIGNAL_0;
869 /* The first resume is not following a fork/vfork/exec. */
870 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
872 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
873 number_of_threads_in_syscalls = 0;
875 clear_proceed_status ();
877 stepping_past_singlestep_breakpoint = 0;
880 /* This enum encodes possible reasons for doing a target_wait, so that
881 wfi can call target_wait in one place. (Ultimately the call will be
882 moved out of the infinite loop entirely.) */
886 infwait_normal_state,
887 infwait_thread_hop_state,
888 infwait_nullified_state,
889 infwait_nonstep_watch_state
892 /* Why did the inferior stop? Used to print the appropriate messages
893 to the interface from within handle_inferior_event(). */
894 enum inferior_stop_reason
896 /* We don't know why. */
898 /* Step, next, nexti, stepi finished. */
900 /* Found breakpoint. */
902 /* Inferior terminated by signal. */
904 /* Inferior exited. */
906 /* Inferior received signal, and user asked to be notified. */
910 /* This structure contains what used to be local variables in
911 wait_for_inferior. Probably many of them can return to being
912 locals in handle_inferior_event. */
914 struct execution_control_state
916 struct target_waitstatus ws;
917 struct target_waitstatus *wp;
920 CORE_ADDR stop_func_start;
921 CORE_ADDR stop_func_end;
922 char *stop_func_name;
923 struct symtab_and_line sal;
924 int remove_breakpoints_on_following_step;
926 struct symtab *current_symtab;
927 int handling_longjmp; /* FIXME */
929 ptid_t saved_inferior_ptid;
930 int stepping_through_solib_after_catch;
931 bpstat stepping_through_solib_catchpoints;
932 int enable_hw_watchpoints_after_wait;
933 int stepping_through_sigtramp;
934 int new_thread_event;
935 struct target_waitstatus tmpstatus;
936 enum infwait_states infwait_state;
941 void init_execution_control_state (struct execution_control_state *ecs);
943 void handle_inferior_event (struct execution_control_state *ecs);
945 static void step_into_function (struct execution_control_state *ecs);
946 static void insert_step_resume_breakpoint (struct frame_info *step_frame,
947 struct execution_control_state *ecs);
948 static void stop_stepping (struct execution_control_state *ecs);
949 static void prepare_to_wait (struct execution_control_state *ecs);
950 static void keep_going (struct execution_control_state *ecs);
951 static void print_stop_reason (enum inferior_stop_reason stop_reason,
954 /* Wait for control to return from inferior to debugger.
955 If inferior gets a signal, we may decide to start it up again
956 instead of returning. That is why there is a loop in this function.
957 When this function actually returns it means the inferior
958 should be left stopped and GDB should read more commands. */
961 wait_for_inferior (void)
963 struct cleanup *old_cleanups;
964 struct execution_control_state ecss;
965 struct execution_control_state *ecs;
967 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
968 &step_resume_breakpoint);
970 /* wfi still stays in a loop, so it's OK just to take the address of
971 a local to get the ecs pointer. */
974 /* Fill in with reasonable starting values. */
975 init_execution_control_state (ecs);
977 /* We'll update this if & when we switch to a new thread. */
978 previous_inferior_ptid = inferior_ptid;
980 overlay_cache_invalid = 1;
982 /* We have to invalidate the registers BEFORE calling target_wait
983 because they can be loaded from the target while in target_wait.
984 This makes remote debugging a bit more efficient for those
985 targets that provide critical registers as part of their normal
988 registers_changed ();
992 if (deprecated_target_wait_hook)
993 ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
995 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
997 /* Now figure out what to do with the result of the result. */
998 handle_inferior_event (ecs);
1000 if (!ecs->wait_some_more)
1003 do_cleanups (old_cleanups);
1006 /* Asynchronous version of wait_for_inferior. It is called by the
1007 event loop whenever a change of state is detected on the file
1008 descriptor corresponding to the target. It can be called more than
1009 once to complete a single execution command. In such cases we need
1010 to keep the state in a global variable ASYNC_ECSS. If it is the
1011 last time that this function is called for a single execution
1012 command, then report to the user that the inferior has stopped, and
1013 do the necessary cleanups. */
1015 struct execution_control_state async_ecss;
1016 struct execution_control_state *async_ecs;
1019 fetch_inferior_event (void *client_data)
1021 static struct cleanup *old_cleanups;
1023 async_ecs = &async_ecss;
1025 if (!async_ecs->wait_some_more)
1027 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1028 &step_resume_breakpoint);
1030 /* Fill in with reasonable starting values. */
1031 init_execution_control_state (async_ecs);
1033 /* We'll update this if & when we switch to a new thread. */
1034 previous_inferior_ptid = inferior_ptid;
1036 overlay_cache_invalid = 1;
1038 /* We have to invalidate the registers BEFORE calling target_wait
1039 because they can be loaded from the target while in target_wait.
1040 This makes remote debugging a bit more efficient for those
1041 targets that provide critical registers as part of their normal
1042 status mechanism. */
1044 registers_changed ();
1047 if (deprecated_target_wait_hook)
1049 deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1051 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1053 /* Now figure out what to do with the result of the result. */
1054 handle_inferior_event (async_ecs);
1056 if (!async_ecs->wait_some_more)
1058 /* Do only the cleanups that have been added by this
1059 function. Let the continuations for the commands do the rest,
1060 if there are any. */
1061 do_exec_cleanups (old_cleanups);
1063 if (step_multi && stop_step)
1064 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1066 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1070 /* Prepare an execution control state for looping through a
1071 wait_for_inferior-type loop. */
1074 init_execution_control_state (struct execution_control_state *ecs)
1076 /* ecs->another_trap? */
1077 ecs->random_signal = 0;
1078 ecs->remove_breakpoints_on_following_step = 0;
1079 ecs->handling_longjmp = 0; /* FIXME */
1080 ecs->stepping_through_solib_after_catch = 0;
1081 ecs->stepping_through_solib_catchpoints = NULL;
1082 ecs->enable_hw_watchpoints_after_wait = 0;
1083 ecs->stepping_through_sigtramp = 0;
1084 ecs->sal = find_pc_line (prev_pc, 0);
1085 ecs->current_line = ecs->sal.line;
1086 ecs->current_symtab = ecs->sal.symtab;
1087 ecs->infwait_state = infwait_normal_state;
1088 ecs->waiton_ptid = pid_to_ptid (-1);
1089 ecs->wp = &(ecs->ws);
1092 /* Call this function before setting step_resume_breakpoint, as a
1093 sanity check. There should never be more than one step-resume
1094 breakpoint per thread, so we should never be setting a new
1095 step_resume_breakpoint when one is already active. */
1097 check_for_old_step_resume_breakpoint (void)
1099 if (step_resume_breakpoint)
1101 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1104 /* Return the cached copy of the last pid/waitstatus returned by
1105 target_wait()/deprecated_target_wait_hook(). The data is actually
1106 cached by handle_inferior_event(), which gets called immediately
1107 after target_wait()/deprecated_target_wait_hook(). */
1110 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1112 *ptidp = target_last_wait_ptid;
1113 *status = target_last_waitstatus;
1116 /* Switch thread contexts, maintaining "infrun state". */
1119 context_switch (struct execution_control_state *ecs)
1121 /* Caution: it may happen that the new thread (or the old one!)
1122 is not in the thread list. In this case we must not attempt
1123 to "switch context", or we run the risk that our context may
1124 be lost. This may happen as a result of the target module
1125 mishandling thread creation. */
1127 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1128 { /* Perform infrun state context switch: */
1129 /* Save infrun state for the old thread. */
1130 save_infrun_state (inferior_ptid, prev_pc,
1131 trap_expected, step_resume_breakpoint,
1133 step_range_end, &step_frame_id,
1134 ecs->handling_longjmp, ecs->another_trap,
1135 ecs->stepping_through_solib_after_catch,
1136 ecs->stepping_through_solib_catchpoints,
1137 ecs->stepping_through_sigtramp,
1138 ecs->current_line, ecs->current_symtab);
1140 /* Load infrun state for the new thread. */
1141 load_infrun_state (ecs->ptid, &prev_pc,
1142 &trap_expected, &step_resume_breakpoint,
1144 &step_range_end, &step_frame_id,
1145 &ecs->handling_longjmp, &ecs->another_trap,
1146 &ecs->stepping_through_solib_after_catch,
1147 &ecs->stepping_through_solib_catchpoints,
1148 &ecs->stepping_through_sigtramp,
1149 &ecs->current_line, &ecs->current_symtab);
1151 inferior_ptid = ecs->ptid;
1155 adjust_pc_after_break (struct execution_control_state *ecs)
1157 CORE_ADDR breakpoint_pc;
1159 /* If this target does not decrement the PC after breakpoints, then
1160 we have nothing to do. */
1161 if (DECR_PC_AFTER_BREAK == 0)
1164 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1165 we aren't, just return.
1167 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1168 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1169 by software breakpoints should be handled through the normal breakpoint
1172 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1173 different signals (SIGILL or SIGEMT for instance), but it is less
1174 clear where the PC is pointing afterwards. It may not match
1175 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1176 these signals at breakpoints (the code has been in GDB since at least
1177 1992) so I can not guess how to handle them here.
1179 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1180 would have the PC after hitting a watchpoint affected by
1181 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1182 in GDB history, and it seems unlikely to be correct, so
1183 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1185 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1188 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1191 /* Find the location where (if we've hit a breakpoint) the
1192 breakpoint would be. */
1193 breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK;
1195 if (SOFTWARE_SINGLE_STEP_P ())
1197 /* When using software single-step, a SIGTRAP can only indicate
1198 an inserted breakpoint. This actually makes things
1200 if (singlestep_breakpoints_inserted_p)
1201 /* When software single stepping, the instruction at [prev_pc]
1202 is never a breakpoint, but the instruction following
1203 [prev_pc] (in program execution order) always is. Assume
1204 that following instruction was reached and hence a software
1205 breakpoint was hit. */
1206 write_pc_pid (breakpoint_pc, ecs->ptid);
1207 else if (software_breakpoint_inserted_here_p (breakpoint_pc))
1208 /* The inferior was free running (i.e., no single-step
1209 breakpoints inserted) and it hit a software breakpoint. */
1210 write_pc_pid (breakpoint_pc, ecs->ptid);
1214 /* When using hardware single-step, a SIGTRAP is reported for
1215 both a completed single-step and a software breakpoint. Need
1216 to differentiate between the two as the latter needs
1217 adjusting but the former does not. */
1218 if (currently_stepping (ecs))
1220 if (prev_pc == breakpoint_pc
1221 && software_breakpoint_inserted_here_p (breakpoint_pc))
1222 /* Hardware single-stepped a software breakpoint (as
1223 occures when the inferior is resumed with PC pointing
1224 at not-yet-hit software breakpoint). Since the
1225 breakpoint really is executed, the inferior needs to be
1226 backed up to the breakpoint address. */
1227 write_pc_pid (breakpoint_pc, ecs->ptid);
1231 if (software_breakpoint_inserted_here_p (breakpoint_pc))
1232 /* The inferior was free running (i.e., no hardware
1233 single-step and no possibility of a false SIGTRAP) and
1234 hit a software breakpoint. */
1235 write_pc_pid (breakpoint_pc, ecs->ptid);
1240 /* Given an execution control state that has been freshly filled in
1241 by an event from the inferior, figure out what it means and take
1242 appropriate action. */
1244 int stepped_after_stopped_by_watchpoint;
1247 handle_inferior_event (struct execution_control_state *ecs)
1249 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1250 thinking that the variable stepped_after_stopped_by_watchpoint
1251 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1252 defined in the file "config/pa/nm-hppah.h", accesses the variable
1253 indirectly. Mutter something rude about the HP merge. */
1254 int sw_single_step_trap_p = 0;
1255 int stopped_by_watchpoint = 0;
1257 /* Cache the last pid/waitstatus. */
1258 target_last_wait_ptid = ecs->ptid;
1259 target_last_waitstatus = *ecs->wp;
1261 adjust_pc_after_break (ecs);
1263 switch (ecs->infwait_state)
1265 case infwait_thread_hop_state:
1266 /* Cancel the waiton_ptid. */
1267 ecs->waiton_ptid = pid_to_ptid (-1);
1268 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1269 is serviced in this loop, below. */
1270 if (ecs->enable_hw_watchpoints_after_wait)
1272 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1273 ecs->enable_hw_watchpoints_after_wait = 0;
1275 stepped_after_stopped_by_watchpoint = 0;
1278 case infwait_normal_state:
1279 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1280 is serviced in this loop, below. */
1281 if (ecs->enable_hw_watchpoints_after_wait)
1283 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1284 ecs->enable_hw_watchpoints_after_wait = 0;
1286 stepped_after_stopped_by_watchpoint = 0;
1289 case infwait_nullified_state:
1290 stepped_after_stopped_by_watchpoint = 0;
1293 case infwait_nonstep_watch_state:
1294 insert_breakpoints ();
1296 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1297 handle things like signals arriving and other things happening
1298 in combination correctly? */
1299 stepped_after_stopped_by_watchpoint = 1;
1303 internal_error (__FILE__, __LINE__, "bad switch");
1305 ecs->infwait_state = infwait_normal_state;
1307 flush_cached_frames ();
1309 /* If it's a new process, add it to the thread database */
1311 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1312 && !ptid_equal (ecs->ptid, minus_one_ptid)
1313 && !in_thread_list (ecs->ptid));
1315 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1316 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1318 add_thread (ecs->ptid);
1320 ui_out_text (uiout, "[New ");
1321 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1322 ui_out_text (uiout, "]\n");
1325 /* NOTE: This block is ONLY meant to be invoked in case of a
1326 "thread creation event"! If it is invoked for any other
1327 sort of event (such as a new thread landing on a breakpoint),
1328 the event will be discarded, which is almost certainly
1331 To avoid this, the low-level module (eg. target_wait)
1332 should call in_thread_list and add_thread, so that the
1333 new thread is known by the time we get here. */
1335 /* We may want to consider not doing a resume here in order
1336 to give the user a chance to play with the new thread.
1337 It might be good to make that a user-settable option. */
1339 /* At this point, all threads are stopped (happens
1340 automatically in either the OS or the native code).
1341 Therefore we need to continue all threads in order to
1344 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1345 prepare_to_wait (ecs);
1350 switch (ecs->ws.kind)
1352 case TARGET_WAITKIND_LOADED:
1353 /* Ignore gracefully during startup of the inferior, as it
1354 might be the shell which has just loaded some objects,
1355 otherwise add the symbols for the newly loaded objects. */
1357 if (stop_soon == NO_STOP_QUIETLY)
1359 /* Remove breakpoints, SOLIB_ADD might adjust
1360 breakpoint addresses via breakpoint_re_set. */
1361 if (breakpoints_inserted)
1362 remove_breakpoints ();
1364 /* Check for any newly added shared libraries if we're
1365 supposed to be adding them automatically. Switch
1366 terminal for any messages produced by
1367 breakpoint_re_set. */
1368 target_terminal_ours_for_output ();
1369 /* NOTE: cagney/2003-11-25: Make certain that the target
1370 stack's section table is kept up-to-date. Architectures,
1371 (e.g., PPC64), use the section table to perform
1372 operations such as address => section name and hence
1373 require the table to contain all sections (including
1374 those found in shared libraries). */
1375 /* NOTE: cagney/2003-11-25: Pass current_target and not
1376 exec_ops to SOLIB_ADD. This is because current GDB is
1377 only tooled to propagate section_table changes out from
1378 the "current_target" (see target_resize_to_sections), and
1379 not up from the exec stratum. This, of course, isn't
1380 right. "infrun.c" should only interact with the
1381 exec/process stratum, instead relying on the target stack
1382 to propagate relevant changes (stop, section table
1383 changed, ...) up to other layers. */
1384 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1385 target_terminal_inferior ();
1387 /* Reinsert breakpoints and continue. */
1388 if (breakpoints_inserted)
1389 insert_breakpoints ();
1392 resume (0, TARGET_SIGNAL_0);
1393 prepare_to_wait (ecs);
1396 case TARGET_WAITKIND_SPURIOUS:
1397 resume (0, TARGET_SIGNAL_0);
1398 prepare_to_wait (ecs);
1401 case TARGET_WAITKIND_EXITED:
1402 target_terminal_ours (); /* Must do this before mourn anyway */
1403 print_stop_reason (EXITED, ecs->ws.value.integer);
1405 /* Record the exit code in the convenience variable $_exitcode, so
1406 that the user can inspect this again later. */
1407 set_internalvar (lookup_internalvar ("_exitcode"),
1408 value_from_longest (builtin_type_int,
1409 (LONGEST) ecs->ws.value.integer));
1410 gdb_flush (gdb_stdout);
1411 target_mourn_inferior ();
1412 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1413 stop_print_frame = 0;
1414 stop_stepping (ecs);
1417 case TARGET_WAITKIND_SIGNALLED:
1418 stop_print_frame = 0;
1419 stop_signal = ecs->ws.value.sig;
1420 target_terminal_ours (); /* Must do this before mourn anyway */
1422 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1423 reach here unless the inferior is dead. However, for years
1424 target_kill() was called here, which hints that fatal signals aren't
1425 really fatal on some systems. If that's true, then some changes
1427 target_mourn_inferior ();
1429 print_stop_reason (SIGNAL_EXITED, stop_signal);
1430 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1431 stop_stepping (ecs);
1434 /* The following are the only cases in which we keep going;
1435 the above cases end in a continue or goto. */
1436 case TARGET_WAITKIND_FORKED:
1437 case TARGET_WAITKIND_VFORKED:
1438 stop_signal = TARGET_SIGNAL_TRAP;
1439 pending_follow.kind = ecs->ws.kind;
1441 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1442 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1444 stop_pc = read_pc ();
1446 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1448 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1450 /* If no catchpoint triggered for this, then keep going. */
1451 if (ecs->random_signal)
1453 stop_signal = TARGET_SIGNAL_0;
1457 goto process_event_stop_test;
1459 case TARGET_WAITKIND_EXECD:
1460 stop_signal = TARGET_SIGNAL_TRAP;
1462 /* NOTE drow/2002-12-05: This code should be pushed down into the
1463 target_wait function. Until then following vfork on HP/UX 10.20
1464 is probably broken by this. Of course, it's broken anyway. */
1465 /* Is this a target which reports multiple exec events per actual
1466 call to exec()? (HP-UX using ptrace does, for example.) If so,
1467 ignore all but the last one. Just resume the exec'r, and wait
1468 for the next exec event. */
1469 if (inferior_ignoring_leading_exec_events)
1471 inferior_ignoring_leading_exec_events--;
1472 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1473 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1475 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1476 prepare_to_wait (ecs);
1479 inferior_ignoring_leading_exec_events =
1480 target_reported_exec_events_per_exec_call () - 1;
1482 pending_follow.execd_pathname =
1483 savestring (ecs->ws.value.execd_pathname,
1484 strlen (ecs->ws.value.execd_pathname));
1486 /* This causes the eventpoints and symbol table to be reset. Must
1487 do this now, before trying to determine whether to stop. */
1488 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1489 xfree (pending_follow.execd_pathname);
1491 stop_pc = read_pc_pid (ecs->ptid);
1492 ecs->saved_inferior_ptid = inferior_ptid;
1493 inferior_ptid = ecs->ptid;
1495 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1497 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1498 inferior_ptid = ecs->saved_inferior_ptid;
1500 /* If no catchpoint triggered for this, then keep going. */
1501 if (ecs->random_signal)
1503 stop_signal = TARGET_SIGNAL_0;
1507 goto process_event_stop_test;
1509 /* These syscall events are returned on HP-UX, as part of its
1510 implementation of page-protection-based "hardware" watchpoints.
1511 HP-UX has unfortunate interactions between page-protections and
1512 some system calls. Our solution is to disable hardware watches
1513 when a system call is entered, and reenable them when the syscall
1514 completes. The downside of this is that we may miss the precise
1515 point at which a watched piece of memory is modified. "Oh well."
1517 Note that we may have multiple threads running, which may each
1518 enter syscalls at roughly the same time. Since we don't have a
1519 good notion currently of whether a watched piece of memory is
1520 thread-private, we'd best not have any page-protections active
1521 when any thread is in a syscall. Thus, we only want to reenable
1522 hardware watches when no threads are in a syscall.
1524 Also, be careful not to try to gather much state about a thread
1525 that's in a syscall. It's frequently a losing proposition. */
1526 case TARGET_WAITKIND_SYSCALL_ENTRY:
1527 number_of_threads_in_syscalls++;
1528 if (number_of_threads_in_syscalls == 1)
1530 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1532 resume (0, TARGET_SIGNAL_0);
1533 prepare_to_wait (ecs);
1536 /* Before examining the threads further, step this thread to
1537 get it entirely out of the syscall. (We get notice of the
1538 event when the thread is just on the verge of exiting a
1539 syscall. Stepping one instruction seems to get it back
1542 Note that although the logical place to reenable h/w watches
1543 is here, we cannot. We cannot reenable them before stepping
1544 the thread (this causes the next wait on the thread to hang).
1546 Nor can we enable them after stepping until we've done a wait.
1547 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1548 here, which will be serviced immediately after the target
1550 case TARGET_WAITKIND_SYSCALL_RETURN:
1551 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1553 if (number_of_threads_in_syscalls > 0)
1555 number_of_threads_in_syscalls--;
1556 ecs->enable_hw_watchpoints_after_wait =
1557 (number_of_threads_in_syscalls == 0);
1559 prepare_to_wait (ecs);
1562 case TARGET_WAITKIND_STOPPED:
1563 stop_signal = ecs->ws.value.sig;
1566 /* We had an event in the inferior, but we are not interested
1567 in handling it at this level. The lower layers have already
1568 done what needs to be done, if anything.
1570 One of the possible circumstances for this is when the
1571 inferior produces output for the console. The inferior has
1572 not stopped, and we are ignoring the event. Another possible
1573 circumstance is any event which the lower level knows will be
1574 reported multiple times without an intervening resume. */
1575 case TARGET_WAITKIND_IGNORE:
1576 prepare_to_wait (ecs);
1580 /* We may want to consider not doing a resume here in order to give
1581 the user a chance to play with the new thread. It might be good
1582 to make that a user-settable option. */
1584 /* At this point, all threads are stopped (happens automatically in
1585 either the OS or the native code). Therefore we need to continue
1586 all threads in order to make progress. */
1587 if (ecs->new_thread_event)
1589 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1590 prepare_to_wait (ecs);
1594 stop_pc = read_pc_pid (ecs->ptid);
1596 if (stepping_past_singlestep_breakpoint)
1598 gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p);
1599 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1600 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1602 stepping_past_singlestep_breakpoint = 0;
1604 /* We've either finished single-stepping past the single-step
1605 breakpoint, or stopped for some other reason. It would be nice if
1606 we could tell, but we can't reliably. */
1607 if (stop_signal == TARGET_SIGNAL_TRAP)
1609 /* Pull the single step breakpoints out of the target. */
1610 SOFTWARE_SINGLE_STEP (0, 0);
1611 singlestep_breakpoints_inserted_p = 0;
1613 ecs->random_signal = 0;
1615 ecs->ptid = saved_singlestep_ptid;
1616 context_switch (ecs);
1617 if (deprecated_context_hook)
1618 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1620 resume (1, TARGET_SIGNAL_0);
1621 prepare_to_wait (ecs);
1626 stepping_past_singlestep_breakpoint = 0;
1628 /* See if a thread hit a thread-specific breakpoint that was meant for
1629 another thread. If so, then step that thread past the breakpoint,
1632 if (stop_signal == TARGET_SIGNAL_TRAP)
1634 int thread_hop_needed = 0;
1636 /* Check if a regular breakpoint has been hit before checking
1637 for a potential single step breakpoint. Otherwise, GDB will
1638 not see this breakpoint hit when stepping onto breakpoints. */
1639 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1641 ecs->random_signal = 0;
1642 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1643 thread_hop_needed = 1;
1645 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1647 ecs->random_signal = 0;
1648 /* The call to in_thread_list is necessary because PTIDs sometimes
1649 change when we go from single-threaded to multi-threaded. If
1650 the singlestep_ptid is still in the list, assume that it is
1651 really different from ecs->ptid. */
1652 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1653 && in_thread_list (singlestep_ptid))
1655 thread_hop_needed = 1;
1656 stepping_past_singlestep_breakpoint = 1;
1657 saved_singlestep_ptid = singlestep_ptid;
1661 if (thread_hop_needed)
1665 /* Saw a breakpoint, but it was hit by the wrong thread.
1668 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1670 /* Pull the single step breakpoints out of the target. */
1671 SOFTWARE_SINGLE_STEP (0, 0);
1672 singlestep_breakpoints_inserted_p = 0;
1675 remove_status = remove_breakpoints ();
1676 /* Did we fail to remove breakpoints? If so, try
1677 to set the PC past the bp. (There's at least
1678 one situation in which we can fail to remove
1679 the bp's: On HP-UX's that use ttrace, we can't
1680 change the address space of a vforking child
1681 process until the child exits (well, okay, not
1682 then either :-) or execs. */
1683 if (remove_status != 0)
1685 /* FIXME! This is obviously non-portable! */
1686 write_pc_pid (stop_pc + 4, ecs->ptid);
1687 /* We need to restart all the threads now,
1688 * unles we're running in scheduler-locked mode.
1689 * Use currently_stepping to determine whether to
1692 /* FIXME MVS: is there any reason not to call resume()? */
1693 if (scheduler_mode == schedlock_on)
1694 target_resume (ecs->ptid,
1695 currently_stepping (ecs), TARGET_SIGNAL_0);
1697 target_resume (RESUME_ALL,
1698 currently_stepping (ecs), TARGET_SIGNAL_0);
1699 prepare_to_wait (ecs);
1704 breakpoints_inserted = 0;
1705 if (!ptid_equal (inferior_ptid, ecs->ptid))
1706 context_switch (ecs);
1707 ecs->waiton_ptid = ecs->ptid;
1708 ecs->wp = &(ecs->ws);
1709 ecs->another_trap = 1;
1711 ecs->infwait_state = infwait_thread_hop_state;
1713 registers_changed ();
1717 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1719 sw_single_step_trap_p = 1;
1720 ecs->random_signal = 0;
1724 ecs->random_signal = 1;
1726 /* See if something interesting happened to the non-current thread. If
1727 so, then switch to that thread. */
1728 if (!ptid_equal (ecs->ptid, inferior_ptid))
1730 context_switch (ecs);
1732 if (deprecated_context_hook)
1733 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1735 flush_cached_frames ();
1738 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1740 /* Pull the single step breakpoints out of the target. */
1741 SOFTWARE_SINGLE_STEP (0, 0);
1742 singlestep_breakpoints_inserted_p = 0;
1745 /* If PC is pointing at a nullified instruction, then step beyond
1746 it so that the user won't be confused when GDB appears to be ready
1749 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1750 if (INSTRUCTION_NULLIFIED)
1752 registers_changed ();
1753 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1755 /* We may have received a signal that we want to pass to
1756 the inferior; therefore, we must not clobber the waitstatus
1759 ecs->infwait_state = infwait_nullified_state;
1760 ecs->waiton_ptid = ecs->ptid;
1761 ecs->wp = &(ecs->tmpstatus);
1762 prepare_to_wait (ecs);
1766 /* It may not be necessary to disable the watchpoint to stop over
1767 it. For example, the PA can (with some kernel cooperation)
1768 single step over a watchpoint without disabling the watchpoint. */
1769 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1772 prepare_to_wait (ecs);
1776 /* It is far more common to need to disable a watchpoint to step
1777 the inferior over it. FIXME. What else might a debug
1778 register or page protection watchpoint scheme need here? */
1779 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1781 /* At this point, we are stopped at an instruction which has
1782 attempted to write to a piece of memory under control of
1783 a watchpoint. The instruction hasn't actually executed
1784 yet. If we were to evaluate the watchpoint expression
1785 now, we would get the old value, and therefore no change
1786 would seem to have occurred.
1788 In order to make watchpoints work `right', we really need
1789 to complete the memory write, and then evaluate the
1790 watchpoint expression. The following code does that by
1791 removing the watchpoint (actually, all watchpoints and
1792 breakpoints), single-stepping the target, re-inserting
1793 watchpoints, and then falling through to let normal
1794 single-step processing handle proceed. Since this
1795 includes evaluating watchpoints, things will come to a
1796 stop in the correct manner. */
1798 remove_breakpoints ();
1799 registers_changed ();
1800 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1802 ecs->waiton_ptid = ecs->ptid;
1803 ecs->wp = &(ecs->ws);
1804 ecs->infwait_state = infwait_nonstep_watch_state;
1805 prepare_to_wait (ecs);
1809 /* It may be possible to simply continue after a watchpoint. */
1810 if (HAVE_CONTINUABLE_WATCHPOINT)
1811 stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws);
1813 ecs->stop_func_start = 0;
1814 ecs->stop_func_end = 0;
1815 ecs->stop_func_name = 0;
1816 /* Don't care about return value; stop_func_start and stop_func_name
1817 will both be 0 if it doesn't work. */
1818 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1819 &ecs->stop_func_start, &ecs->stop_func_end);
1820 ecs->stop_func_start += FUNCTION_START_OFFSET;
1821 ecs->another_trap = 0;
1822 bpstat_clear (&stop_bpstat);
1824 stop_stack_dummy = 0;
1825 stop_print_frame = 1;
1826 ecs->random_signal = 0;
1827 stopped_by_random_signal = 0;
1828 breakpoints_failed = 0;
1830 /* Look at the cause of the stop, and decide what to do.
1831 The alternatives are:
1832 1) break; to really stop and return to the debugger,
1833 2) drop through to start up again
1834 (set ecs->another_trap to 1 to single step once)
1835 3) set ecs->random_signal to 1, and the decision between 1 and 2
1836 will be made according to the signal handling tables. */
1838 /* First, distinguish signals caused by the debugger from signals
1839 that have to do with the program's own actions. Note that
1840 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1841 on the operating system version. Here we detect when a SIGILL or
1842 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1843 something similar for SIGSEGV, since a SIGSEGV will be generated
1844 when we're trying to execute a breakpoint instruction on a
1845 non-executable stack. This happens for call dummy breakpoints
1846 for architectures like SPARC that place call dummies on the
1849 if (stop_signal == TARGET_SIGNAL_TRAP
1850 || (breakpoints_inserted &&
1851 (stop_signal == TARGET_SIGNAL_ILL
1852 || stop_signal == TARGET_SIGNAL_SEGV
1853 || stop_signal == TARGET_SIGNAL_EMT))
1854 || stop_soon == STOP_QUIETLY
1855 || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1857 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1859 stop_print_frame = 0;
1860 stop_stepping (ecs);
1864 /* This is originated from start_remote(), start_inferior() and
1865 shared libraries hook functions. */
1866 if (stop_soon == STOP_QUIETLY)
1868 stop_stepping (ecs);
1872 /* This originates from attach_command(). We need to overwrite
1873 the stop_signal here, because some kernels don't ignore a
1874 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1875 See more comments in inferior.h. */
1876 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1878 stop_stepping (ecs);
1879 if (stop_signal == TARGET_SIGNAL_STOP)
1880 stop_signal = TARGET_SIGNAL_0;
1884 /* Don't even think about breakpoints if just proceeded over a
1886 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1887 bpstat_clear (&stop_bpstat);
1890 /* See if there is a breakpoint at the current PC. */
1891 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid,
1892 stopped_by_watchpoint);
1894 /* Following in case break condition called a
1896 stop_print_frame = 1;
1899 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1900 at one stage in the past included checks for an inferior
1901 function call's call dummy's return breakpoint. The original
1902 comment, that went with the test, read:
1904 ``End of a stack dummy. Some systems (e.g. Sony news) give
1905 another signal besides SIGTRAP, so check here as well as
1908 If someone ever tries to get get call dummys on a
1909 non-executable stack to work (where the target would stop
1910 with something like a SIGSEGV), then those tests might need
1911 to be re-instated. Given, however, that the tests were only
1912 enabled when momentary breakpoints were not being used, I
1913 suspect that it won't be the case.
1915 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1916 be necessary for call dummies on a non-executable stack on
1919 if (stop_signal == TARGET_SIGNAL_TRAP)
1921 = !(bpstat_explains_signal (stop_bpstat)
1923 || (step_range_end && step_resume_breakpoint == NULL));
1926 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1927 if (!ecs->random_signal)
1928 stop_signal = TARGET_SIGNAL_TRAP;
1932 /* When we reach this point, we've pretty much decided
1933 that the reason for stopping must've been a random
1934 (unexpected) signal. */
1937 ecs->random_signal = 1;
1939 process_event_stop_test:
1940 /* For the program's own signals, act according to
1941 the signal handling tables. */
1943 if (ecs->random_signal)
1945 /* Signal not for debugging purposes. */
1948 stopped_by_random_signal = 1;
1950 if (signal_print[stop_signal])
1953 target_terminal_ours_for_output ();
1954 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
1956 if (signal_stop[stop_signal])
1958 stop_stepping (ecs);
1961 /* If not going to stop, give terminal back
1962 if we took it away. */
1964 target_terminal_inferior ();
1966 /* Clear the signal if it should not be passed. */
1967 if (signal_program[stop_signal] == 0)
1968 stop_signal = TARGET_SIGNAL_0;
1970 if (step_range_end != 0
1971 && stop_signal != TARGET_SIGNAL_0
1972 && stop_pc >= step_range_start && stop_pc < step_range_end
1973 && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id))
1975 /* The inferior is about to take a signal that will take it
1976 out of the single step range. Set a breakpoint at the
1977 current PC (which is presumably where the signal handler
1978 will eventually return) and then allow the inferior to
1981 Note that this is only needed for a signal delivered
1982 while in the single-step range. Nested signals aren't a
1983 problem as they eventually all return. */
1984 insert_step_resume_breakpoint (get_current_frame (), ecs);
1990 /* Handle cases caused by hitting a breakpoint. */
1992 CORE_ADDR jmp_buf_pc;
1993 struct bpstat_what what;
1995 what = bpstat_what (stop_bpstat);
1997 if (what.call_dummy)
1999 stop_stack_dummy = 1;
2002 switch (what.main_action)
2004 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2005 /* If we hit the breakpoint at longjmp, disable it for the
2006 duration of this command. Then, install a temporary
2007 breakpoint at the target of the jmp_buf. */
2008 disable_longjmp_breakpoint ();
2009 remove_breakpoints ();
2010 breakpoints_inserted = 0;
2011 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
2017 /* Need to blow away step-resume breakpoint, as it
2018 interferes with us */
2019 if (step_resume_breakpoint != NULL)
2021 delete_step_resume_breakpoint (&step_resume_breakpoint);
2025 /* FIXME - Need to implement nested temporary breakpoints */
2026 if (step_over_calls > 0)
2027 set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ());
2030 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2031 ecs->handling_longjmp = 1; /* FIXME */
2035 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2036 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2037 remove_breakpoints ();
2038 breakpoints_inserted = 0;
2040 /* FIXME - Need to implement nested temporary breakpoints */
2042 && (frame_id_inner (get_frame_id (get_current_frame ()),
2045 ecs->another_trap = 1;
2050 disable_longjmp_breakpoint ();
2051 ecs->handling_longjmp = 0; /* FIXME */
2052 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2054 /* else fallthrough */
2056 case BPSTAT_WHAT_SINGLE:
2057 if (breakpoints_inserted)
2059 remove_breakpoints ();
2061 breakpoints_inserted = 0;
2062 ecs->another_trap = 1;
2063 /* Still need to check other stuff, at least the case
2064 where we are stepping and step out of the right range. */
2067 case BPSTAT_WHAT_STOP_NOISY:
2068 stop_print_frame = 1;
2070 /* We are about to nuke the step_resume_breakpointt via the
2071 cleanup chain, so no need to worry about it here. */
2073 stop_stepping (ecs);
2076 case BPSTAT_WHAT_STOP_SILENT:
2077 stop_print_frame = 0;
2079 /* We are about to nuke the step_resume_breakpoin via the
2080 cleanup chain, so no need to worry about it here. */
2082 stop_stepping (ecs);
2085 case BPSTAT_WHAT_STEP_RESUME:
2086 /* This proably demands a more elegant solution, but, yeah
2089 This function's use of the simple variable
2090 step_resume_breakpoint doesn't seem to accomodate
2091 simultaneously active step-resume bp's, although the
2092 breakpoint list certainly can.
2094 If we reach here and step_resume_breakpoint is already
2095 NULL, then apparently we have multiple active
2096 step-resume bp's. We'll just delete the breakpoint we
2097 stopped at, and carry on.
2099 Correction: what the code currently does is delete a
2100 step-resume bp, but it makes no effort to ensure that
2101 the one deleted is the one currently stopped at. MVS */
2103 if (step_resume_breakpoint == NULL)
2105 step_resume_breakpoint =
2106 bpstat_find_step_resume_breakpoint (stop_bpstat);
2108 delete_step_resume_breakpoint (&step_resume_breakpoint);
2111 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2112 /* If were waiting for a trap, hitting the step_resume_break
2113 doesn't count as getting it. */
2115 ecs->another_trap = 1;
2118 case BPSTAT_WHAT_CHECK_SHLIBS:
2119 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2122 /* Remove breakpoints, we eventually want to step over the
2123 shlib event breakpoint, and SOLIB_ADD might adjust
2124 breakpoint addresses via breakpoint_re_set. */
2125 if (breakpoints_inserted)
2126 remove_breakpoints ();
2127 breakpoints_inserted = 0;
2129 /* Check for any newly added shared libraries if we're
2130 supposed to be adding them automatically. Switch
2131 terminal for any messages produced by
2132 breakpoint_re_set. */
2133 target_terminal_ours_for_output ();
2134 /* NOTE: cagney/2003-11-25: Make certain that the target
2135 stack's section table is kept up-to-date. Architectures,
2136 (e.g., PPC64), use the section table to perform
2137 operations such as address => section name and hence
2138 require the table to contain all sections (including
2139 those found in shared libraries). */
2140 /* NOTE: cagney/2003-11-25: Pass current_target and not
2141 exec_ops to SOLIB_ADD. This is because current GDB is
2142 only tooled to propagate section_table changes out from
2143 the "current_target" (see target_resize_to_sections), and
2144 not up from the exec stratum. This, of course, isn't
2145 right. "infrun.c" should only interact with the
2146 exec/process stratum, instead relying on the target stack
2147 to propagate relevant changes (stop, section table
2148 changed, ...) up to other layers. */
2149 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2150 target_terminal_inferior ();
2152 /* Try to reenable shared library breakpoints, additional
2153 code segments in shared libraries might be mapped in now. */
2154 re_enable_breakpoints_in_shlibs ();
2156 /* If requested, stop when the dynamic linker notifies
2157 gdb of events. This allows the user to get control
2158 and place breakpoints in initializer routines for
2159 dynamically loaded objects (among other things). */
2160 if (stop_on_solib_events || stop_stack_dummy)
2162 stop_stepping (ecs);
2166 /* If we stopped due to an explicit catchpoint, then the
2167 (see above) call to SOLIB_ADD pulled in any symbols
2168 from a newly-loaded library, if appropriate.
2170 We do want the inferior to stop, but not where it is
2171 now, which is in the dynamic linker callback. Rather,
2172 we would like it stop in the user's program, just after
2173 the call that caused this catchpoint to trigger. That
2174 gives the user a more useful vantage from which to
2175 examine their program's state. */
2176 else if (what.main_action ==
2177 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2179 /* ??rehrauer: If I could figure out how to get the
2180 right return PC from here, we could just set a temp
2181 breakpoint and resume. I'm not sure we can without
2182 cracking open the dld's shared libraries and sniffing
2183 their unwind tables and text/data ranges, and that's
2184 not a terribly portable notion.
2186 Until that time, we must step the inferior out of the
2187 dld callback, and also out of the dld itself (and any
2188 code or stubs in libdld.sl, such as "shl_load" and
2189 friends) until we reach non-dld code. At that point,
2190 we can stop stepping. */
2191 bpstat_get_triggered_catchpoints (stop_bpstat,
2193 stepping_through_solib_catchpoints);
2194 ecs->stepping_through_solib_after_catch = 1;
2196 /* Be sure to lift all breakpoints, so the inferior does
2197 actually step past this point... */
2198 ecs->another_trap = 1;
2203 /* We want to step over this breakpoint, then keep going. */
2204 ecs->another_trap = 1;
2211 case BPSTAT_WHAT_LAST:
2212 /* Not a real code, but listed here to shut up gcc -Wall. */
2214 case BPSTAT_WHAT_KEEP_CHECKING:
2219 /* We come here if we hit a breakpoint but should not
2220 stop for it. Possibly we also were stepping
2221 and should stop for that. So fall through and
2222 test for stepping. But, if not stepping,
2225 /* Are we stepping to get the inferior out of the dynamic
2226 linker's hook (and possibly the dld itself) after catching
2228 if (ecs->stepping_through_solib_after_catch)
2230 #if defined(SOLIB_ADD)
2231 /* Have we reached our destination? If not, keep going. */
2232 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2234 ecs->another_trap = 1;
2239 /* Else, stop and report the catchpoint(s) whose triggering
2240 caused us to begin stepping. */
2241 ecs->stepping_through_solib_after_catch = 0;
2242 bpstat_clear (&stop_bpstat);
2243 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2244 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2245 stop_print_frame = 1;
2246 stop_stepping (ecs);
2250 if (step_resume_breakpoint)
2252 /* Having a step-resume breakpoint overrides anything
2253 else having to do with stepping commands until
2254 that breakpoint is reached. */
2259 if (step_range_end == 0)
2261 /* Likewise if we aren't even stepping. */
2266 /* If stepping through a line, keep going if still within it.
2268 Note that step_range_end is the address of the first instruction
2269 beyond the step range, and NOT the address of the last instruction
2271 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2277 /* We stepped out of the stepping range. */
2279 /* If we are stepping at the source level and entered the runtime
2280 loader dynamic symbol resolution code, we keep on single stepping
2281 until we exit the run time loader code and reach the callee's
2283 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2284 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2286 CORE_ADDR pc_after_resolver =
2287 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2289 if (pc_after_resolver)
2291 /* Set up a step-resume breakpoint at the address
2292 indicated by SKIP_SOLIB_RESOLVER. */
2293 struct symtab_and_line sr_sal;
2295 sr_sal.pc = pc_after_resolver;
2297 check_for_old_step_resume_breakpoint ();
2298 step_resume_breakpoint =
2299 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2300 if (breakpoints_inserted)
2301 insert_breakpoints ();
2308 if (step_range_end != 1
2309 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2310 || step_over_calls == STEP_OVER_ALL)
2311 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2313 /* The inferior, while doing a "step" or "next", has ended up in
2314 a signal trampoline (either by a signal being delivered or by
2315 the signal handler returning). Just single-step until the
2316 inferior leaves the trampoline (either by calling the handler
2322 if (frame_id_eq (frame_unwind_id (get_current_frame ()),
2325 /* It's a subroutine call. */
2326 CORE_ADDR real_stop_pc;
2328 if ((step_over_calls == STEP_OVER_NONE)
2329 || ((step_range_end == 1)
2330 && in_prologue (prev_pc, ecs->stop_func_start)))
2332 /* I presume that step_over_calls is only 0 when we're
2333 supposed to be stepping at the assembly language level
2334 ("stepi"). Just stop. */
2335 /* Also, maybe we just did a "nexti" inside a prolog, so we
2336 thought it was a subroutine call but it was not. Stop as
2339 print_stop_reason (END_STEPPING_RANGE, 0);
2340 stop_stepping (ecs);
2344 if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc))
2346 /* We're doing a "next", set a breakpoint at callee's return
2347 address (the address at which the caller will
2349 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()),
2355 /* If we are in a function call trampoline (a stub between the
2356 calling routine and the real function), locate the real
2357 function. That's what tells us (a) whether we want to step
2358 into it at all, and (b) what prologue we want to run to the
2359 end of, if we do step into it. */
2360 real_stop_pc = skip_language_trampoline (stop_pc);
2361 if (real_stop_pc == 0)
2362 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2363 if (real_stop_pc != 0)
2364 ecs->stop_func_start = real_stop_pc;
2366 if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start))
2368 struct symtab_and_line sr_sal;
2370 sr_sal.pc = ecs->stop_func_start;
2372 check_for_old_step_resume_breakpoint ();
2373 step_resume_breakpoint =
2374 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2375 if (breakpoints_inserted)
2376 insert_breakpoints ();
2382 /* If we have line number information for the function we are
2383 thinking of stepping into, step into it.
2385 If there are several symtabs at that PC (e.g. with include
2386 files), just want to know whether *any* of them have line
2387 numbers. find_pc_line handles this. */
2389 struct symtab_and_line tmp_sal;
2391 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2392 if (tmp_sal.line != 0)
2394 step_into_function (ecs);
2399 /* If we have no line number and the step-stop-if-no-debug is
2400 set, we stop the step so that the user has a chance to switch
2401 in assembly mode. */
2402 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2405 print_stop_reason (END_STEPPING_RANGE, 0);
2406 stop_stepping (ecs);
2410 /* Set a breakpoint at callee's return address (the address at
2411 which the caller will resume). */
2412 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), ecs);
2417 /* If we're in the return path from a shared library trampoline,
2418 we want to proceed through the trampoline when stepping. */
2419 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2421 /* Determine where this trampoline returns. */
2422 CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2424 /* Only proceed through if we know where it's going. */
2427 /* And put the step-breakpoint there and go until there. */
2428 struct symtab_and_line sr_sal;
2430 init_sal (&sr_sal); /* initialize to zeroes */
2431 sr_sal.pc = real_stop_pc;
2432 sr_sal.section = find_pc_overlay (sr_sal.pc);
2433 /* Do not specify what the fp should be when we stop
2434 since on some machines the prologue
2435 is where the new fp value is established. */
2436 check_for_old_step_resume_breakpoint ();
2437 step_resume_breakpoint =
2438 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2439 if (breakpoints_inserted)
2440 insert_breakpoints ();
2442 /* Restart without fiddling with the step ranges or
2449 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2450 the trampoline processing logic, however, there are some trampolines
2451 that have no names, so we should do trampoline handling first. */
2452 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2453 && ecs->stop_func_name == NULL)
2455 /* The inferior just stepped into, or returned to, an
2456 undebuggable function (where there is no symbol, not even a
2457 minimal symbol, corresponding to the address where the
2458 inferior stopped). Since we want to skip this kind of code,
2459 we keep going until the inferior returns from this
2461 if (step_stop_if_no_debug)
2463 /* If we have no line number and the step-stop-if-no-debug
2464 is set, we stop the step so that the user has a chance to
2465 switch in assembly mode. */
2467 print_stop_reason (END_STEPPING_RANGE, 0);
2468 stop_stepping (ecs);
2473 /* Set a breakpoint at callee's return address (the address
2474 at which the caller will resume). */
2475 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()),
2482 if (step_range_end == 1)
2484 /* It is stepi or nexti. We always want to stop stepping after
2487 print_stop_reason (END_STEPPING_RANGE, 0);
2488 stop_stepping (ecs);
2492 ecs->sal = find_pc_line (stop_pc, 0);
2494 if (ecs->sal.line == 0)
2496 /* We have no line number information. That means to stop
2497 stepping (does this always happen right after one instruction,
2498 when we do "s" in a function with no line numbers,
2499 or can this happen as a result of a return or longjmp?). */
2501 print_stop_reason (END_STEPPING_RANGE, 0);
2502 stop_stepping (ecs);
2506 if ((stop_pc == ecs->sal.pc)
2507 && (ecs->current_line != ecs->sal.line
2508 || ecs->current_symtab != ecs->sal.symtab))
2510 /* We are at the start of a different line. So stop. Note that
2511 we don't stop if we step into the middle of a different line.
2512 That is said to make things like for (;;) statements work
2515 print_stop_reason (END_STEPPING_RANGE, 0);
2516 stop_stepping (ecs);
2520 /* We aren't done stepping.
2522 Optimize by setting the stepping range to the line.
2523 (We might not be in the original line, but if we entered a
2524 new line in mid-statement, we continue stepping. This makes
2525 things like for(;;) statements work better.) */
2527 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2529 /* If this is the last line of the function, don't keep stepping
2530 (it would probably step us out of the function).
2531 This is particularly necessary for a one-line function,
2532 in which after skipping the prologue we better stop even though
2533 we will be in mid-line. */
2535 print_stop_reason (END_STEPPING_RANGE, 0);
2536 stop_stepping (ecs);
2539 step_range_start = ecs->sal.pc;
2540 step_range_end = ecs->sal.end;
2541 step_frame_id = get_frame_id (get_current_frame ());
2542 ecs->current_line = ecs->sal.line;
2543 ecs->current_symtab = ecs->sal.symtab;
2545 /* In the case where we just stepped out of a function into the
2546 middle of a line of the caller, continue stepping, but
2547 step_frame_id must be modified to current frame */
2549 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2550 generous. It will trigger on things like a step into a frameless
2551 stackless leaf function. I think the logic should instead look
2552 at the unwound frame ID has that should give a more robust
2553 indication of what happened. */
2554 if (step-ID == current-ID)
2555 still stepping in same function;
2556 else if (step-ID == unwind (current-ID))
2557 stepped into a function;
2559 stepped out of a function;
2560 /* Of course this assumes that the frame ID unwind code is robust
2561 and we're willing to introduce frame unwind logic into this
2562 function. Fortunately, those days are nearly upon us. */
2565 struct frame_id current_frame = get_frame_id (get_current_frame ());
2566 if (!(frame_id_inner (current_frame, step_frame_id)))
2567 step_frame_id = current_frame;
2573 /* Are we in the middle of stepping? */
2576 currently_stepping (struct execution_control_state *ecs)
2578 return ((!ecs->handling_longjmp
2579 && ((step_range_end && step_resume_breakpoint == NULL)
2581 || ecs->stepping_through_solib_after_catch
2582 || bpstat_should_step ());
2585 /* Subroutine call with source code we should not step over. Do step
2586 to the first line of code in it. */
2589 step_into_function (struct execution_control_state *ecs)
2592 struct symtab_and_line sr_sal;
2594 s = find_pc_symtab (stop_pc);
2595 if (s && s->language != language_asm)
2596 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2598 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2599 /* Use the step_resume_break to step until the end of the prologue,
2600 even if that involves jumps (as it seems to on the vax under
2602 /* If the prologue ends in the middle of a source line, continue to
2603 the end of that source line (if it is still within the function).
2604 Otherwise, just go to end of prologue. */
2606 && ecs->sal.pc != ecs->stop_func_start
2607 && ecs->sal.end < ecs->stop_func_end)
2608 ecs->stop_func_start = ecs->sal.end;
2610 /* Architectures which require breakpoint adjustment might not be able
2611 to place a breakpoint at the computed address. If so, the test
2612 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2613 ecs->stop_func_start to an address at which a breakpoint may be
2614 legitimately placed.
2616 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2617 made, GDB will enter an infinite loop when stepping through
2618 optimized code consisting of VLIW instructions which contain
2619 subinstructions corresponding to different source lines. On
2620 FR-V, it's not permitted to place a breakpoint on any but the
2621 first subinstruction of a VLIW instruction. When a breakpoint is
2622 set, GDB will adjust the breakpoint address to the beginning of
2623 the VLIW instruction. Thus, we need to make the corresponding
2624 adjustment here when computing the stop address. */
2626 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2628 ecs->stop_func_start
2629 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2630 ecs->stop_func_start);
2633 if (ecs->stop_func_start == stop_pc)
2635 /* We are already there: stop now. */
2637 print_stop_reason (END_STEPPING_RANGE, 0);
2638 stop_stepping (ecs);
2643 /* Put the step-breakpoint there and go until there. */
2644 init_sal (&sr_sal); /* initialize to zeroes */
2645 sr_sal.pc = ecs->stop_func_start;
2646 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2647 /* Do not specify what the fp should be when we stop since on
2648 some machines the prologue is where the new fp value is
2650 check_for_old_step_resume_breakpoint ();
2651 step_resume_breakpoint =
2652 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2653 if (breakpoints_inserted)
2654 insert_breakpoints ();
2656 /* And make sure stepping stops right away then. */
2657 step_range_end = step_range_start;
2662 /* The inferior, as a result of a function call (has left) or signal
2663 (about to leave) the single-step range. Set a momentary breakpoint
2664 within the step range where the inferior is expected to later
2668 insert_step_resume_breakpoint (struct frame_info *step_frame,
2669 struct execution_control_state *ecs)
2671 struct symtab_and_line sr_sal;
2673 /* This is only used within the step-resume range/frame. */
2674 gdb_assert (frame_id_eq (step_frame_id, get_frame_id (step_frame)));
2675 gdb_assert (step_range_end != 0);
2676 /* Remember, if the call instruction is the last in the step range,
2677 the breakpoint will land just beyond that. Hence ``<=
2678 step_range_end''. Also, ignore check when "nexti". */
2679 gdb_assert (step_range_start == step_range_end
2680 || (get_frame_pc (step_frame) >= step_range_start
2681 && get_frame_pc (step_frame) <= step_range_end));
2683 init_sal (&sr_sal); /* initialize to zeros */
2685 sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (step_frame));
2686 sr_sal.section = find_pc_overlay (sr_sal.pc);
2688 check_for_old_step_resume_breakpoint ();
2690 step_resume_breakpoint
2691 = set_momentary_breakpoint (sr_sal, get_frame_id (step_frame),
2694 if (breakpoints_inserted)
2695 insert_breakpoints ();
2699 stop_stepping (struct execution_control_state *ecs)
2701 /* Let callers know we don't want to wait for the inferior anymore. */
2702 ecs->wait_some_more = 0;
2705 /* This function handles various cases where we need to continue
2706 waiting for the inferior. */
2707 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2710 keep_going (struct execution_control_state *ecs)
2712 /* Save the pc before execution, to compare with pc after stop. */
2713 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2715 /* If we did not do break;, it means we should keep running the
2716 inferior and not return to debugger. */
2718 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2720 /* We took a signal (which we are supposed to pass through to
2721 the inferior, else we'd have done a break above) and we
2722 haven't yet gotten our trap. Simply continue. */
2723 resume (currently_stepping (ecs), stop_signal);
2727 /* Either the trap was not expected, but we are continuing
2728 anyway (the user asked that this signal be passed to the
2731 The signal was SIGTRAP, e.g. it was our signal, but we
2732 decided we should resume from it.
2734 We're going to run this baby now!
2736 Insert breakpoints now, unless we are trying to one-proceed
2737 past a breakpoint. */
2738 /* If we've just finished a special step resume and we don't
2739 want to hit a breakpoint, pull em out. */
2740 if (step_resume_breakpoint == NULL
2741 && ecs->remove_breakpoints_on_following_step)
2743 ecs->remove_breakpoints_on_following_step = 0;
2744 remove_breakpoints ();
2745 breakpoints_inserted = 0;
2747 else if (!breakpoints_inserted && !ecs->another_trap)
2749 breakpoints_failed = insert_breakpoints ();
2750 if (breakpoints_failed)
2752 stop_stepping (ecs);
2755 breakpoints_inserted = 1;
2758 trap_expected = ecs->another_trap;
2760 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2761 specifies that such a signal should be delivered to the
2764 Typically, this would occure when a user is debugging a
2765 target monitor on a simulator: the target monitor sets a
2766 breakpoint; the simulator encounters this break-point and
2767 halts the simulation handing control to GDB; GDB, noteing
2768 that the break-point isn't valid, returns control back to the
2769 simulator; the simulator then delivers the hardware
2770 equivalent of a SIGNAL_TRAP to the program being debugged. */
2772 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2773 stop_signal = TARGET_SIGNAL_0;
2776 resume (currently_stepping (ecs), stop_signal);
2779 prepare_to_wait (ecs);
2782 /* This function normally comes after a resume, before
2783 handle_inferior_event exits. It takes care of any last bits of
2784 housekeeping, and sets the all-important wait_some_more flag. */
2787 prepare_to_wait (struct execution_control_state *ecs)
2789 if (ecs->infwait_state == infwait_normal_state)
2791 overlay_cache_invalid = 1;
2793 /* We have to invalidate the registers BEFORE calling
2794 target_wait because they can be loaded from the target while
2795 in target_wait. This makes remote debugging a bit more
2796 efficient for those targets that provide critical registers
2797 as part of their normal status mechanism. */
2799 registers_changed ();
2800 ecs->waiton_ptid = pid_to_ptid (-1);
2801 ecs->wp = &(ecs->ws);
2803 /* This is the old end of the while loop. Let everybody know we
2804 want to wait for the inferior some more and get called again
2806 ecs->wait_some_more = 1;
2809 /* Print why the inferior has stopped. We always print something when
2810 the inferior exits, or receives a signal. The rest of the cases are
2811 dealt with later on in normal_stop() and print_it_typical(). Ideally
2812 there should be a call to this function from handle_inferior_event()
2813 each time stop_stepping() is called.*/
2815 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2817 switch (stop_reason)
2820 /* We don't deal with these cases from handle_inferior_event()
2823 case END_STEPPING_RANGE:
2824 /* We are done with a step/next/si/ni command. */
2825 /* For now print nothing. */
2826 /* Print a message only if not in the middle of doing a "step n"
2827 operation for n > 1 */
2828 if (!step_multi || !stop_step)
2829 if (ui_out_is_mi_like_p (uiout))
2830 ui_out_field_string (uiout, "reason", "end-stepping-range");
2832 case BREAKPOINT_HIT:
2833 /* We found a breakpoint. */
2834 /* For now print nothing. */
2837 /* The inferior was terminated by a signal. */
2838 annotate_signalled ();
2839 if (ui_out_is_mi_like_p (uiout))
2840 ui_out_field_string (uiout, "reason", "exited-signalled");
2841 ui_out_text (uiout, "\nProgram terminated with signal ");
2842 annotate_signal_name ();
2843 ui_out_field_string (uiout, "signal-name",
2844 target_signal_to_name (stop_info));
2845 annotate_signal_name_end ();
2846 ui_out_text (uiout, ", ");
2847 annotate_signal_string ();
2848 ui_out_field_string (uiout, "signal-meaning",
2849 target_signal_to_string (stop_info));
2850 annotate_signal_string_end ();
2851 ui_out_text (uiout, ".\n");
2852 ui_out_text (uiout, "The program no longer exists.\n");
2855 /* The inferior program is finished. */
2856 annotate_exited (stop_info);
2859 if (ui_out_is_mi_like_p (uiout))
2860 ui_out_field_string (uiout, "reason", "exited");
2861 ui_out_text (uiout, "\nProgram exited with code ");
2862 ui_out_field_fmt (uiout, "exit-code", "0%o",
2863 (unsigned int) stop_info);
2864 ui_out_text (uiout, ".\n");
2868 if (ui_out_is_mi_like_p (uiout))
2869 ui_out_field_string (uiout, "reason", "exited-normally");
2870 ui_out_text (uiout, "\nProgram exited normally.\n");
2873 case SIGNAL_RECEIVED:
2874 /* Signal received. The signal table tells us to print about
2877 ui_out_text (uiout, "\nProgram received signal ");
2878 annotate_signal_name ();
2879 if (ui_out_is_mi_like_p (uiout))
2880 ui_out_field_string (uiout, "reason", "signal-received");
2881 ui_out_field_string (uiout, "signal-name",
2882 target_signal_to_name (stop_info));
2883 annotate_signal_name_end ();
2884 ui_out_text (uiout, ", ");
2885 annotate_signal_string ();
2886 ui_out_field_string (uiout, "signal-meaning",
2887 target_signal_to_string (stop_info));
2888 annotate_signal_string_end ();
2889 ui_out_text (uiout, ".\n");
2892 internal_error (__FILE__, __LINE__,
2893 "print_stop_reason: unrecognized enum value");
2899 /* Here to return control to GDB when the inferior stops for real.
2900 Print appropriate messages, remove breakpoints, give terminal our modes.
2902 STOP_PRINT_FRAME nonzero means print the executing frame
2903 (pc, function, args, file, line number and line text).
2904 BREAKPOINTS_FAILED nonzero means stop was due to error
2905 attempting to insert breakpoints. */
2910 struct target_waitstatus last;
2913 get_last_target_status (&last_ptid, &last);
2915 /* As with the notification of thread events, we want to delay
2916 notifying the user that we've switched thread context until
2917 the inferior actually stops.
2919 There's no point in saying anything if the inferior has exited.
2920 Note that SIGNALLED here means "exited with a signal", not
2921 "received a signal". */
2922 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
2923 && target_has_execution
2924 && last.kind != TARGET_WAITKIND_SIGNALLED
2925 && last.kind != TARGET_WAITKIND_EXITED)
2927 target_terminal_ours_for_output ();
2928 printf_filtered ("[Switching to %s]\n",
2929 target_pid_or_tid_to_str (inferior_ptid));
2930 previous_inferior_ptid = inferior_ptid;
2933 /* NOTE drow/2004-01-17: Is this still necessary? */
2934 /* Make sure that the current_frame's pc is correct. This
2935 is a correction for setting up the frame info before doing
2936 DECR_PC_AFTER_BREAK */
2937 if (target_has_execution)
2938 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2939 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2940 frame code to check for this and sort out any resultant mess.
2941 DECR_PC_AFTER_BREAK needs to just go away. */
2942 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2944 if (target_has_execution && breakpoints_inserted)
2946 if (remove_breakpoints ())
2948 target_terminal_ours_for_output ();
2949 printf_filtered ("Cannot remove breakpoints because ");
2950 printf_filtered ("program is no longer writable.\n");
2951 printf_filtered ("It might be running in another process.\n");
2952 printf_filtered ("Further execution is probably impossible.\n");
2955 breakpoints_inserted = 0;
2957 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2958 Delete any breakpoint that is to be deleted at the next stop. */
2960 breakpoint_auto_delete (stop_bpstat);
2962 /* If an auto-display called a function and that got a signal,
2963 delete that auto-display to avoid an infinite recursion. */
2965 if (stopped_by_random_signal)
2966 disable_current_display ();
2968 /* Don't print a message if in the middle of doing a "step n"
2969 operation for n > 1 */
2970 if (step_multi && stop_step)
2973 target_terminal_ours ();
2975 /* Look up the hook_stop and run it (CLI internally handles problem
2976 of stop_command's pre-hook not existing). */
2978 catch_errors (hook_stop_stub, stop_command,
2979 "Error while running hook_stop:\n", RETURN_MASK_ALL);
2981 if (!target_has_stack)
2987 /* Select innermost stack frame - i.e., current frame is frame 0,
2988 and current location is based on that.
2989 Don't do this on return from a stack dummy routine,
2990 or if the program has exited. */
2992 if (!stop_stack_dummy)
2994 select_frame (get_current_frame ());
2996 /* Print current location without a level number, if
2997 we have changed functions or hit a breakpoint.
2998 Print source line if we have one.
2999 bpstat_print() contains the logic deciding in detail
3000 what to print, based on the event(s) that just occurred. */
3002 if (stop_print_frame && deprecated_selected_frame)
3006 int do_frame_printing = 1;
3008 bpstat_ret = bpstat_print (stop_bpstat);
3012 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3013 (or should) carry around the function and does (or
3014 should) use that when doing a frame comparison. */
3016 && frame_id_eq (step_frame_id,
3017 get_frame_id (get_current_frame ()))
3018 && step_start_function == find_pc_function (stop_pc))
3019 source_flag = SRC_LINE; /* finished step, just print source line */
3021 source_flag = SRC_AND_LOC; /* print location and source line */
3023 case PRINT_SRC_AND_LOC:
3024 source_flag = SRC_AND_LOC; /* print location and source line */
3026 case PRINT_SRC_ONLY:
3027 source_flag = SRC_LINE;
3030 source_flag = SRC_LINE; /* something bogus */
3031 do_frame_printing = 0;
3034 internal_error (__FILE__, __LINE__, "Unknown value.");
3036 /* For mi, have the same behavior every time we stop:
3037 print everything but the source line. */
3038 if (ui_out_is_mi_like_p (uiout))
3039 source_flag = LOC_AND_ADDRESS;
3041 if (ui_out_is_mi_like_p (uiout))
3042 ui_out_field_int (uiout, "thread-id",
3043 pid_to_thread_id (inferior_ptid));
3044 /* The behavior of this routine with respect to the source
3046 SRC_LINE: Print only source line
3047 LOCATION: Print only location
3048 SRC_AND_LOC: Print location and source line */
3049 if (do_frame_printing)
3050 print_stack_frame (get_selected_frame (), 0, source_flag);
3052 /* Display the auto-display expressions. */
3057 /* Save the function value return registers, if we care.
3058 We might be about to restore their previous contents. */
3059 if (proceed_to_finish)
3060 /* NB: The copy goes through to the target picking up the value of
3061 all the registers. */
3062 regcache_cpy (stop_registers, current_regcache);
3064 if (stop_stack_dummy)
3066 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3067 ends with a setting of the current frame, so we can use that
3069 frame_pop (get_current_frame ());
3070 /* Set stop_pc to what it was before we called the function.
3071 Can't rely on restore_inferior_status because that only gets
3072 called if we don't stop in the called function. */
3073 stop_pc = read_pc ();
3074 select_frame (get_current_frame ());
3078 annotate_stopped ();
3079 observer_notify_normal_stop (stop_bpstat);
3083 hook_stop_stub (void *cmd)
3085 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3090 signal_stop_state (int signo)
3092 return signal_stop[signo];
3096 signal_print_state (int signo)
3098 return signal_print[signo];
3102 signal_pass_state (int signo)
3104 return signal_program[signo];
3108 signal_stop_update (int signo, int state)
3110 int ret = signal_stop[signo];
3111 signal_stop[signo] = state;
3116 signal_print_update (int signo, int state)
3118 int ret = signal_print[signo];
3119 signal_print[signo] = state;
3124 signal_pass_update (int signo, int state)
3126 int ret = signal_program[signo];
3127 signal_program[signo] = state;
3132 sig_print_header (void)
3135 Signal Stop\tPrint\tPass to program\tDescription\n");
3139 sig_print_info (enum target_signal oursig)
3141 char *name = target_signal_to_name (oursig);
3142 int name_padding = 13 - strlen (name);
3144 if (name_padding <= 0)
3147 printf_filtered ("%s", name);
3148 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3149 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3150 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3151 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3152 printf_filtered ("%s\n", target_signal_to_string (oursig));
3155 /* Specify how various signals in the inferior should be handled. */
3158 handle_command (char *args, int from_tty)
3161 int digits, wordlen;
3162 int sigfirst, signum, siglast;
3163 enum target_signal oursig;
3166 unsigned char *sigs;
3167 struct cleanup *old_chain;
3171 error_no_arg ("signal to handle");
3174 /* Allocate and zero an array of flags for which signals to handle. */
3176 nsigs = (int) TARGET_SIGNAL_LAST;
3177 sigs = (unsigned char *) alloca (nsigs);
3178 memset (sigs, 0, nsigs);
3180 /* Break the command line up into args. */
3182 argv = buildargv (args);
3187 old_chain = make_cleanup_freeargv (argv);
3189 /* Walk through the args, looking for signal oursigs, signal names, and
3190 actions. Signal numbers and signal names may be interspersed with
3191 actions, with the actions being performed for all signals cumulatively
3192 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3194 while (*argv != NULL)
3196 wordlen = strlen (*argv);
3197 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3201 sigfirst = siglast = -1;
3203 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3205 /* Apply action to all signals except those used by the
3206 debugger. Silently skip those. */
3209 siglast = nsigs - 1;
3211 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3213 SET_SIGS (nsigs, sigs, signal_stop);
3214 SET_SIGS (nsigs, sigs, signal_print);
3216 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3218 UNSET_SIGS (nsigs, sigs, signal_program);
3220 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3222 SET_SIGS (nsigs, sigs, signal_print);
3224 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3226 SET_SIGS (nsigs, sigs, signal_program);
3228 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3230 UNSET_SIGS (nsigs, sigs, signal_stop);
3232 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3234 SET_SIGS (nsigs, sigs, signal_program);
3236 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3238 UNSET_SIGS (nsigs, sigs, signal_print);
3239 UNSET_SIGS (nsigs, sigs, signal_stop);
3241 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3243 UNSET_SIGS (nsigs, sigs, signal_program);
3245 else if (digits > 0)
3247 /* It is numeric. The numeric signal refers to our own
3248 internal signal numbering from target.h, not to host/target
3249 signal number. This is a feature; users really should be
3250 using symbolic names anyway, and the common ones like
3251 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3253 sigfirst = siglast = (int)
3254 target_signal_from_command (atoi (*argv));
3255 if ((*argv)[digits] == '-')
3258 target_signal_from_command (atoi ((*argv) + digits + 1));
3260 if (sigfirst > siglast)
3262 /* Bet he didn't figure we'd think of this case... */
3270 oursig = target_signal_from_name (*argv);
3271 if (oursig != TARGET_SIGNAL_UNKNOWN)
3273 sigfirst = siglast = (int) oursig;
3277 /* Not a number and not a recognized flag word => complain. */
3278 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3282 /* If any signal numbers or symbol names were found, set flags for
3283 which signals to apply actions to. */
3285 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3287 switch ((enum target_signal) signum)
3289 case TARGET_SIGNAL_TRAP:
3290 case TARGET_SIGNAL_INT:
3291 if (!allsigs && !sigs[signum])
3293 if (query ("%s is used by the debugger.\n\
3294 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3300 printf_unfiltered ("Not confirmed, unchanged.\n");
3301 gdb_flush (gdb_stdout);
3305 case TARGET_SIGNAL_0:
3306 case TARGET_SIGNAL_DEFAULT:
3307 case TARGET_SIGNAL_UNKNOWN:
3308 /* Make sure that "all" doesn't print these. */
3319 target_notice_signals (inferior_ptid);
3323 /* Show the results. */
3324 sig_print_header ();
3325 for (signum = 0; signum < nsigs; signum++)
3329 sig_print_info (signum);
3334 do_cleanups (old_chain);
3338 xdb_handle_command (char *args, int from_tty)
3341 struct cleanup *old_chain;
3343 /* Break the command line up into args. */
3345 argv = buildargv (args);
3350 old_chain = make_cleanup_freeargv (argv);
3351 if (argv[1] != (char *) NULL)
3356 bufLen = strlen (argv[0]) + 20;
3357 argBuf = (char *) xmalloc (bufLen);
3361 enum target_signal oursig;
3363 oursig = target_signal_from_name (argv[0]);
3364 memset (argBuf, 0, bufLen);
3365 if (strcmp (argv[1], "Q") == 0)
3366 sprintf (argBuf, "%s %s", argv[0], "noprint");
3369 if (strcmp (argv[1], "s") == 0)
3371 if (!signal_stop[oursig])
3372 sprintf (argBuf, "%s %s", argv[0], "stop");
3374 sprintf (argBuf, "%s %s", argv[0], "nostop");
3376 else if (strcmp (argv[1], "i") == 0)
3378 if (!signal_program[oursig])
3379 sprintf (argBuf, "%s %s", argv[0], "pass");
3381 sprintf (argBuf, "%s %s", argv[0], "nopass");
3383 else if (strcmp (argv[1], "r") == 0)
3385 if (!signal_print[oursig])
3386 sprintf (argBuf, "%s %s", argv[0], "print");
3388 sprintf (argBuf, "%s %s", argv[0], "noprint");
3394 handle_command (argBuf, from_tty);
3396 printf_filtered ("Invalid signal handling flag.\n");
3401 do_cleanups (old_chain);
3404 /* Print current contents of the tables set by the handle command.
3405 It is possible we should just be printing signals actually used
3406 by the current target (but for things to work right when switching
3407 targets, all signals should be in the signal tables). */
3410 signals_info (char *signum_exp, int from_tty)
3412 enum target_signal oursig;
3413 sig_print_header ();
3417 /* First see if this is a symbol name. */
3418 oursig = target_signal_from_name (signum_exp);
3419 if (oursig == TARGET_SIGNAL_UNKNOWN)
3421 /* No, try numeric. */
3423 target_signal_from_command (parse_and_eval_long (signum_exp));
3425 sig_print_info (oursig);
3429 printf_filtered ("\n");
3430 /* These ugly casts brought to you by the native VAX compiler. */
3431 for (oursig = TARGET_SIGNAL_FIRST;
3432 (int) oursig < (int) TARGET_SIGNAL_LAST;
3433 oursig = (enum target_signal) ((int) oursig + 1))
3437 if (oursig != TARGET_SIGNAL_UNKNOWN
3438 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3439 sig_print_info (oursig);
3442 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3445 struct inferior_status
3447 enum target_signal stop_signal;
3451 int stop_stack_dummy;
3452 int stopped_by_random_signal;
3454 CORE_ADDR step_range_start;
3455 CORE_ADDR step_range_end;
3456 struct frame_id step_frame_id;
3457 enum step_over_calls_kind step_over_calls;
3458 CORE_ADDR step_resume_break_address;
3459 int stop_after_trap;
3461 struct regcache *stop_registers;
3463 /* These are here because if call_function_by_hand has written some
3464 registers and then decides to call error(), we better not have changed
3466 struct regcache *registers;
3468 /* A frame unique identifier. */
3469 struct frame_id selected_frame_id;
3471 int breakpoint_proceeded;
3472 int restore_stack_info;
3473 int proceed_to_finish;
3477 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3480 int size = DEPRECATED_REGISTER_RAW_SIZE (regno);
3481 void *buf = alloca (size);
3482 store_signed_integer (buf, size, val);
3483 regcache_raw_write (inf_status->registers, regno, buf);
3486 /* Save all of the information associated with the inferior<==>gdb
3487 connection. INF_STATUS is a pointer to a "struct inferior_status"
3488 (defined in inferior.h). */
3490 struct inferior_status *
3491 save_inferior_status (int restore_stack_info)
3493 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3495 inf_status->stop_signal = stop_signal;
3496 inf_status->stop_pc = stop_pc;
3497 inf_status->stop_step = stop_step;
3498 inf_status->stop_stack_dummy = stop_stack_dummy;
3499 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3500 inf_status->trap_expected = trap_expected;
3501 inf_status->step_range_start = step_range_start;
3502 inf_status->step_range_end = step_range_end;
3503 inf_status->step_frame_id = step_frame_id;
3504 inf_status->step_over_calls = step_over_calls;
3505 inf_status->stop_after_trap = stop_after_trap;
3506 inf_status->stop_soon = stop_soon;
3507 /* Save original bpstat chain here; replace it with copy of chain.
3508 If caller's caller is walking the chain, they'll be happier if we
3509 hand them back the original chain when restore_inferior_status is
3511 inf_status->stop_bpstat = stop_bpstat;
3512 stop_bpstat = bpstat_copy (stop_bpstat);
3513 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3514 inf_status->restore_stack_info = restore_stack_info;
3515 inf_status->proceed_to_finish = proceed_to_finish;
3517 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3519 inf_status->registers = regcache_dup (current_regcache);
3521 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3526 restore_selected_frame (void *args)
3528 struct frame_id *fid = (struct frame_id *) args;
3529 struct frame_info *frame;
3531 frame = frame_find_by_id (*fid);
3533 /* If inf_status->selected_frame_id is NULL, there was no previously
3537 warning ("Unable to restore previously selected frame.\n");
3541 select_frame (frame);
3547 restore_inferior_status (struct inferior_status *inf_status)
3549 stop_signal = inf_status->stop_signal;
3550 stop_pc = inf_status->stop_pc;
3551 stop_step = inf_status->stop_step;
3552 stop_stack_dummy = inf_status->stop_stack_dummy;
3553 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3554 trap_expected = inf_status->trap_expected;
3555 step_range_start = inf_status->step_range_start;
3556 step_range_end = inf_status->step_range_end;
3557 step_frame_id = inf_status->step_frame_id;
3558 step_over_calls = inf_status->step_over_calls;
3559 stop_after_trap = inf_status->stop_after_trap;
3560 stop_soon = inf_status->stop_soon;
3561 bpstat_clear (&stop_bpstat);
3562 stop_bpstat = inf_status->stop_bpstat;
3563 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3564 proceed_to_finish = inf_status->proceed_to_finish;
3566 /* FIXME: Is the restore of stop_registers always needed. */
3567 regcache_xfree (stop_registers);
3568 stop_registers = inf_status->stop_registers;
3570 /* The inferior can be gone if the user types "print exit(0)"
3571 (and perhaps other times). */
3572 if (target_has_execution)
3573 /* NB: The register write goes through to the target. */
3574 regcache_cpy (current_regcache, inf_status->registers);
3575 regcache_xfree (inf_status->registers);
3577 /* FIXME: If we are being called after stopping in a function which
3578 is called from gdb, we should not be trying to restore the
3579 selected frame; it just prints a spurious error message (The
3580 message is useful, however, in detecting bugs in gdb (like if gdb
3581 clobbers the stack)). In fact, should we be restoring the
3582 inferior status at all in that case? . */
3584 if (target_has_stack && inf_status->restore_stack_info)
3586 /* The point of catch_errors is that if the stack is clobbered,
3587 walking the stack might encounter a garbage pointer and
3588 error() trying to dereference it. */
3590 (restore_selected_frame, &inf_status->selected_frame_id,
3591 "Unable to restore previously selected frame:\n",
3592 RETURN_MASK_ERROR) == 0)
3593 /* Error in restoring the selected frame. Select the innermost
3595 select_frame (get_current_frame ());
3603 do_restore_inferior_status_cleanup (void *sts)
3605 restore_inferior_status (sts);
3609 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3611 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3615 discard_inferior_status (struct inferior_status *inf_status)
3617 /* See save_inferior_status for info on stop_bpstat. */
3618 bpstat_clear (&inf_status->stop_bpstat);
3619 regcache_xfree (inf_status->registers);
3620 regcache_xfree (inf_status->stop_registers);
3625 inferior_has_forked (int pid, int *child_pid)
3627 struct target_waitstatus last;
3630 get_last_target_status (&last_ptid, &last);
3632 if (last.kind != TARGET_WAITKIND_FORKED)
3635 if (ptid_get_pid (last_ptid) != pid)
3638 *child_pid = last.value.related_pid;
3643 inferior_has_vforked (int pid, int *child_pid)
3645 struct target_waitstatus last;
3648 get_last_target_status (&last_ptid, &last);
3650 if (last.kind != TARGET_WAITKIND_VFORKED)
3653 if (ptid_get_pid (last_ptid) != pid)
3656 *child_pid = last.value.related_pid;
3661 inferior_has_execd (int pid, char **execd_pathname)
3663 struct target_waitstatus last;
3666 get_last_target_status (&last_ptid, &last);
3668 if (last.kind != TARGET_WAITKIND_EXECD)
3671 if (ptid_get_pid (last_ptid) != pid)
3674 *execd_pathname = xstrdup (last.value.execd_pathname);
3678 /* Oft used ptids */
3680 ptid_t minus_one_ptid;
3682 /* Create a ptid given the necessary PID, LWP, and TID components. */
3685 ptid_build (int pid, long lwp, long tid)
3695 /* Create a ptid from just a pid. */
3698 pid_to_ptid (int pid)
3700 return ptid_build (pid, 0, 0);
3703 /* Fetch the pid (process id) component from a ptid. */
3706 ptid_get_pid (ptid_t ptid)
3711 /* Fetch the lwp (lightweight process) component from a ptid. */
3714 ptid_get_lwp (ptid_t ptid)
3719 /* Fetch the tid (thread id) component from a ptid. */
3722 ptid_get_tid (ptid_t ptid)
3727 /* ptid_equal() is used to test equality of two ptids. */
3730 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3732 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3733 && ptid1.tid == ptid2.tid);
3736 /* restore_inferior_ptid() will be used by the cleanup machinery
3737 to restore the inferior_ptid value saved in a call to
3738 save_inferior_ptid(). */
3741 restore_inferior_ptid (void *arg)
3743 ptid_t *saved_ptid_ptr = arg;
3744 inferior_ptid = *saved_ptid_ptr;
3748 /* Save the value of inferior_ptid so that it may be restored by a
3749 later call to do_cleanups(). Returns the struct cleanup pointer
3750 needed for later doing the cleanup. */
3753 save_inferior_ptid (void)
3755 ptid_t *saved_ptid_ptr;
3757 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3758 *saved_ptid_ptr = inferior_ptid;
3759 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3766 stop_registers = regcache_xmalloc (current_gdbarch);
3770 _initialize_infrun (void)
3774 struct cmd_list_element *c;
3776 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers);
3777 deprecated_register_gdbarch_swap (NULL, 0, build_infrun);
3779 add_info ("signals", signals_info,
3780 "What debugger does when program gets various signals.\n\
3781 Specify a signal as argument to print info on that signal only.");
3782 add_info_alias ("handle", "signals", 0);
3784 add_com ("handle", class_run, handle_command,
3785 concat ("Specify how to handle a signal.\n\
3786 Args are signals and actions to apply to those signals.\n\
3787 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3788 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3789 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3790 The special arg \"all\" is recognized to mean all signals except those\n\
3791 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3792 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3793 Stop means reenter debugger if this signal happens (implies print).\n\
3794 Print means print a message if this signal happens.\n\
3795 Pass means let program see this signal; otherwise program doesn't know.\n\
3796 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3797 Pass and Stop may be combined.", NULL));
3800 add_com ("lz", class_info, signals_info,
3801 "What debugger does when program gets various signals.\n\
3802 Specify a signal as argument to print info on that signal only.");
3803 add_com ("z", class_run, xdb_handle_command,
3804 concat ("Specify how to handle a signal.\n\
3805 Args are signals and actions to apply to those signals.\n\
3806 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3807 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3808 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3809 The special arg \"all\" is recognized to mean all signals except those\n\
3810 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3811 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3812 nopass), \"Q\" (noprint)\n\
3813 Stop means reenter debugger if this signal happens (implies print).\n\
3814 Print means print a message if this signal happens.\n\
3815 Pass means let program see this signal; otherwise program doesn't know.\n\
3816 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3817 Pass and Stop may be combined.", NULL));
3822 add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\
3823 This allows you to set a list of commands to be run each time execution\n\
3824 of the program stops.", &cmdlist);
3826 numsigs = (int) TARGET_SIGNAL_LAST;
3827 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
3828 signal_print = (unsigned char *)
3829 xmalloc (sizeof (signal_print[0]) * numsigs);
3830 signal_program = (unsigned char *)
3831 xmalloc (sizeof (signal_program[0]) * numsigs);
3832 for (i = 0; i < numsigs; i++)
3835 signal_print[i] = 1;
3836 signal_program[i] = 1;
3839 /* Signals caused by debugger's own actions
3840 should not be given to the program afterwards. */
3841 signal_program[TARGET_SIGNAL_TRAP] = 0;
3842 signal_program[TARGET_SIGNAL_INT] = 0;
3844 /* Signals that are not errors should not normally enter the debugger. */
3845 signal_stop[TARGET_SIGNAL_ALRM] = 0;
3846 signal_print[TARGET_SIGNAL_ALRM] = 0;
3847 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
3848 signal_print[TARGET_SIGNAL_VTALRM] = 0;
3849 signal_stop[TARGET_SIGNAL_PROF] = 0;
3850 signal_print[TARGET_SIGNAL_PROF] = 0;
3851 signal_stop[TARGET_SIGNAL_CHLD] = 0;
3852 signal_print[TARGET_SIGNAL_CHLD] = 0;
3853 signal_stop[TARGET_SIGNAL_IO] = 0;
3854 signal_print[TARGET_SIGNAL_IO] = 0;
3855 signal_stop[TARGET_SIGNAL_POLL] = 0;
3856 signal_print[TARGET_SIGNAL_POLL] = 0;
3857 signal_stop[TARGET_SIGNAL_URG] = 0;
3858 signal_print[TARGET_SIGNAL_URG] = 0;
3859 signal_stop[TARGET_SIGNAL_WINCH] = 0;
3860 signal_print[TARGET_SIGNAL_WINCH] = 0;
3862 /* These signals are used internally by user-level thread
3863 implementations. (See signal(5) on Solaris.) Like the above
3864 signals, a healthy program receives and handles them as part of
3865 its normal operation. */
3866 signal_stop[TARGET_SIGNAL_LWP] = 0;
3867 signal_print[TARGET_SIGNAL_LWP] = 0;
3868 signal_stop[TARGET_SIGNAL_WAITING] = 0;
3869 signal_print[TARGET_SIGNAL_WAITING] = 0;
3870 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
3871 signal_print[TARGET_SIGNAL_CANCEL] = 0;
3875 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
3876 (char *) &stop_on_solib_events,
3877 "Set stopping for shared library events.\n\
3878 If nonzero, gdb will give control to the user when the dynamic linker\n\
3879 notifies gdb of shared library events. The most common event of interest\n\
3880 to the user would be loading/unloading of a new library.\n", &setlist), &showlist);
3883 c = add_set_enum_cmd ("follow-fork-mode",
3885 follow_fork_mode_kind_names, &follow_fork_mode_string,
3886 "Set debugger response to a program call of fork \
3888 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3889 parent - the original process is debugged after a fork\n\
3890 child - the new process is debugged after a fork\n\
3891 The unfollowed process will continue to run.\n\
3892 By default, the debugger will follow the parent process.", &setlist);
3893 add_show_from_set (c, &showlist);
3895 c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */
3896 &scheduler_mode, /* current mode */
3897 "Set mode for locking scheduler during execution.\n\
3898 off == no locking (threads may preempt at any time)\n\
3899 on == full locking (no thread except the current thread may run)\n\
3900 step == scheduler locked during every single-step operation.\n\
3901 In this mode, no other thread may run during a step command.\n\
3902 Other threads may run while stepping over a function call ('next').", &setlist);
3904 set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */
3905 add_show_from_set (c, &showlist);
3907 c = add_set_cmd ("step-mode", class_run,
3908 var_boolean, (char *) &step_stop_if_no_debug,
3909 "Set mode of the step operation. When set, doing a step over a\n\
3910 function without debug line information will stop at the first\n\
3911 instruction of that function. Otherwise, the function is skipped and\n\
3912 the step command stops at a different source line.", &setlist);
3913 add_show_from_set (c, &showlist);
3915 /* ptid initializations */
3916 null_ptid = ptid_build (0, 0, 0);
3917 minus_one_ptid = ptid_build (-1, 0, 0);
3918 inferior_ptid = null_ptid;
3919 target_last_wait_ptid = minus_one_ptid;